scripts: add linter rule for using context.WithTimeout on tests

[hasson82]

This PR is adding a linter rule for checking each context usage in tests is using context.WithTimeout.
Based on #7304.

The PR grew a lot, so decided to ignore some packages in the linter rule and will deal with them in upcoming PRs.

RELEASE NOTES: none

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: hasson82 (150515f, 7da7920, 0430481, e7192b1, 689ae5b, c29c45c, 96345b1, d47051e, f0f0952, aa71ff0, 912de44, 59a3855, 9cb967d, befaa3d, 6a51d0d, c47300f, 58ff83f, a4e7742, 832789b, 7f744cd, 40a54fb, cfc815b, d595842, eaccdda, 5acc6e3, 4a7ec24, 53cc270, c33cbef, a1e7035, cb43ba0, 3081de9, 4b89735, fdca263, 9719207, d1aefe7, d76f29c, 136b4ba, 6c25072)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.47%. Comparing base (4dd7f55) to head (136b4ba).
Report is 23 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7342      +/-   ##
==========================================
+ Coverage   80.58%   81.47%   +0.89%     
==========================================
  Files         349      348       -1     
  Lines       34056    26744    -7312     
==========================================
- Hits        27445    21791    -5654     
+ Misses       5431     3770    -1661     
- Partials     1180     1183       +3     

see 307 files with indirect coverage changes

[dfawley]

Thanks for doing this. It looks great generally, but I have a nit about creating contexts with timeout only once per test in several of the tests changed.

[dfawley]

That looks good, thank you.