feat(onboarding): use summary view if hitting platform limits

[jamietanna]

Changes

As part of #41502, we're introducing a Platform-limit-aware
onboarding/reconfigure flow that will provide a summary where
appropriate.

This improves the experience where onboarding a large monorepo to
Renovate, especially when it produces an onboarding/reconfigure PR that
is too large to fit within Platform limits.

If we detect the Platform limits being exceeded for a given PR, we'll
switch to the "summary" view.

This builds on top of 4fbfc60 and bcd44b9, which introduced the
main changes this then enables.

Context

Please select one of the following:

• This closes an existing Issue, Closes: Onboarding PRs that reach Platform limits should convert to a summary #41502
• This doesn't close an Issue, but I accept the risk that this PR may be closed if maintainers disagree with its opening or implementation

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Please select one option and, if yes, briefly describe how AI was used (e.g., code, tests, docs) and which tool(s) you used.

• No — I did not use AI for this contribution.
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• Yes — substantive assistance (AI-generated non‑trivial portions of code, tests, or documentation).
• Yes — other (please describe):

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests, but ran on a real repository, or
• Both unit tests + ran on a real repository

The public repository:

• Configure: chore: Configure Renovate JamieTanna-Mend-testing/ag-ui#3
• Reconfigure: reconfigure JamieTanna-Mend-testing/ag-ui-reconfigure#1

[secustor]

Looking at the linked PRs, we should use the same formatting as we are doing on the DependencyDashboard. ( collapsible + count )
#2958

[jamietanna]

I had thought about that - the issue is that it does lead to extra characters for all the <details> - but lemme confirm that with one of the examples just to be sure

[jamietanna]

If we look at the bundler and github-actions blocks:

<details> (minified HTML)

2109 characters

<details><summary>bundler (3)</summary><blockquote><details><summary>sdks/community/ruby/Gemfile</summary></details>

<details><summary>github-actions (25)</summary><blockquote><details><summary>.github/workflows/auto-approve-community.yml</summary></details><details><summary>.github/workflows/build-python-preview.yml</summary></details><details><summary>.github/workflows/dependabot-auto-merge.yml</summary></details><details><summary>.github/workflows/dependabot-major-analysis.yml</summary></details><details><summary>.github/workflows/dojo-e2e.yml</summary></details><details><summary>.github/workflows/lint-release-workflows.yml</summary></details><details><summary>.github/workflows/pr-check-binaries.yml</summary></details><details><summary>.github/workflows/prepare-release.yml</summary></details><details><summary>.github/workflows/publish-commit.yml</summary></details><details><summary>.github/workflows/publish-java-sdk.yml</summary></details><details><summary>.github/workflows/publish-kotlin-sdk.yml</summary></details><details><summary>.github/workflows/publish-python-preview.yml</summary></details><details><summary>.github/workflows/publish-release.yml</summary></details><details><summary>.github/workflows/rust-lint-test.yml</summary></details><details><summary>.github/workflows/security-fork-pr-alert.yml</summary></details><details><summary>.github/workflows/test-release-scripts.yml</summary></details><details><summary>.github/workflows/unit-dart-sdk.yml</summary></details><details><summary>.github/workflows/unit-genkit-go.yml</summary></details><details><summary>.github/workflows/unit-go-sdk.yml</summary></details><details><summary>.github/workflows/unit-java-sdk.yml</summary></details><details><summary>.github/workflows/unit-kotlin-sdk.yml</summary></details><details><summary>.github/workflows/unit-python-sdk.yml</summary></details><details><summary>.github/workflows/unit-ruby-sdk.yml</summary></details><details><summary>.github/workflows/unit-typescript-sdk.yml</summary></details><details><summary>.github/workflows/zizmor.yml</summary></details></blockquote></details>

Via #43764

930 characters

#### bundler

 * `sdks/community/ruby/Gemfile`
 * `sdks/community/ruby/example/rails/Gemfile`
 * `sdks/community/ruby/example/simple-use/Gemfile`

#### github-actions

 * `.github/workflows/`
   * `auto-approve-community.yml`
   * `build-python-preview.yml`
   * `dependabot-auto-merge.yml`
   * `dependabot-major-analysis.yml`
   * `dojo-e2e.yml`
   * `lint-release-workflows.yml`
   * `pr-check-binaries.yml`
   * `prepare-release.yml`
   * `publish-commit.yml`
   * `publish-java-sdk.yml`
   * `publish-kotlin-sdk.yml`
   * `publish-python-preview.yml`
   * `publish-release.yml`
   * `rust-lint-test.yml`
   * `security-fork-pr-alert.yml`
   * `test-release-scripts.yml`
   * `unit-dart-sdk.yml`
   * `unit-genkit-go.yml`
   * `unit-go-sdk.yml`
   * `unit-java-sdk.yml`
   * `unit-kotlin-sdk.yml`
   * `unit-python-sdk.yml`
   * `unit-ruby-sdk.yml`
   * `unit-typescript-sdk.yml`
   * `zizmor.yml`

[jamietanna]

Although yes it's a bit nicer + more consistent rendering, it's expensive, especially when we're trying to optimise for reduced spare characters

[github-actions]

🎉 This PR is included in version 43.275.0 🎉

The release is available on:

• GitHub release
• 43.275.0

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