ni/python-actions/analyze-project does not think mypy is installed

[bkeryan]

Bug Report

mypy is installed, but ni/python-actions/analyze-project does not run it.

Repro or Code Sample

Introduce typing errors to code.
Run PR workflow.
Example: https://github.com/ni/nitypes-python/actions/runs/18022788195/job/51283815366

Expected Behavior

Mypy runs and fails.

Current Behavior

Mypy does not run.

Context

Testing a suggestion for ni/nitypes-python#200

Your Environment

GitHub

AB#3330140

[bkeryan]

We should also add a test project where the checks fail, and have the test workflow verify that they fail.

[bkeryan]

Reopening because there are no tests.

On further thought, we should test these cases:

• project w/passing nps, mypy, pyright
• project with nps errors
• project with mypy errors
• project with pyright errors
• project with only nps
• run again with cached venv