Fix ruff lint and format violations

[ashnanze]

Fix ruff lint and format violations

Summary

Fixes ruff lint and format violations.

Changes

• _utils.py: Fix W1203 (use lazy % formatting instead of f-strings in logger.debug calls) + apply ruff format
• test_utils_.py: Fix I001 (sort imports alphabetically) + apply ruff format
• _constants.py: Apply ruff format
• setup.py: Pin ruff>=0.7.2,<0.16.0 to prevent breaking changes from ruff 0.16.0's new default rules

Testing

• ruff check src/connectedk8s — passes
• ruff format --check src/connectedk8s — passes
• No functional code changes; lint/format only

[github-actions]

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Please sync the latest code with latest dev branch (for azure-cli) or main branch (for azure-cli-extensions).
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pip install azdev --upgrade
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