Add daily Python 3.13 CPU-only tests to nightly workflow

[rohithpudari]

fixes #21508

Adds build-python-latest job in Nightly pipeline

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.75%. Comparing base (1d647c3) to head (3d4823a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21566      +/-   ##
==========================================
- Coverage   85.05%   82.75%   -2.31%     
==========================================
  Files         567      567              
  Lines       56455    56455              
  Branches     8815     8815              
==========================================
- Hits        48018    46717    -1301     
- Misses       6161     7577    +1416     
+ Partials     2276     2161     -115     

Flag	Coverage Δ
keras	82.55% <ø> (-2.32%)	⬇️
keras-jax	63.79% <ø> (-2.33%)	⬇️
keras-numpy	58.31% <ø> (-0.12%)	⬇️
keras-openvino	34.64% <ø> (-0.13%)	⬇️
keras-tensorflow	64.23% <ø> (-2.33%)	⬇️
keras-torch	63.84% <ø> (-2.32%)	⬇️
keras.applications	?
keras.applications-jax	?
keras.applications-numpy	?
keras.applications-openvino	?
keras.applications-tensorflow	?
keras.applications-torch	?

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ 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.