Fix bug which prevents Lakeshore blocking_t from exiting

[Thomas (trlemon)]

Issue

When setting blocking_t(), in the function wait_until_setpoint_reached(), the setpoint parameter is called to get the latest setpoint. However, this can be problematic since it doesn't always fetch the last set setpoint, likely due to the setpoint parameter being called before the instrument has time to update properly. If the wrong setpoint is returned, then the while loop inside of wait_until_setpoint_reached() will never exit because the temperature will never be in tolerance.

Solution (changes)

Call self.setpoint.get_latest() instead of self.setpoint() to ensure the last set value is used instead.
Add post_delay to setpoint parameter.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.88%. Comparing base (372b8e4) to head (dd8b447).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7796   +/-   ##
=======================================
  Coverage   59.88%   59.88%           
=======================================
  Files         352      352           
  Lines       31818    31818           
=======================================
  Hits        19055    19055           
  Misses      12763    12763           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.