Add integ test workflow

[simonmarty]

Description

Why is this change being made?

1. Automate running integration tests.

What is changing?

1. Add workflow to run integration tests.
2. Add workflow to remove the safe-to-test label when new commits are added.

Related Links

• Issue #, if available:

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Testing

How was this tested?

1. Tested on my fork.

When testing locally, provide testing artifact(s):

1. https://github.com/simonmarty/aws-secretsmanager-caching-python/actions/runs/23772036941/job/69265512669

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Reviewee Checklist

Update the checklist after submitting the PR

• I have reviewed, tested and understand all changes
  If not, why:
• I have filled out the Description and Testing sections above
  If not, why:
• Build and Unit tests are passing
  If not, why:
• Unit test coverage check is passing
  If not, why:
• Integration tests pass locally
  If not, why:
• I have updated integration tests (if needed)
  If not, why:
• I have ensured no sensitive information is leaking (i.e., no logging of sensitive fields, or otherwise)
  If not, why:
• I have added explanatory comments for complex logic, new classes/methods and new tests
  If not, why:
• I have updated README/documentation (if needed)
  If not, why:
• I have clearly called out breaking changes (if any)
  If not, why:

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Reviewer Checklist

All reviewers please ensure the following are true before reviewing:

• Reviewee checklist has been accurately filled out
• Code changes align with stated purpose in description
• Test coverage adequately validates the changes

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.14%. Comparing base (0caf212) to head (601e759).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #71   +/-   ##
=======================================
  Coverage   98.14%   98.14%           
=======================================
  Files           8        8           
  Lines         270      270           
=======================================
  Hits          265      265           
  Misses          5        5           

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