filtering out dtgen related files in code coverage report

[Bob-Chen222]

Description of changes:

filtering out dtgen related files in code coverage report in ci. Previously the problem is that gcov in codecov/action will be run again as plugin and all the .gcov files will be generated and included into the final report. I disabled gcov by specify the pycoverage to be used as plugin, which temporarily solved the problem. Since we are going to move ci to proj I think this solution is good enough for now. I will investigate further in the background

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.10%. Comparing base (f93e262) to head (4103cc8).

❗ Current head 4103cc8 differs from pull request most recent head ec02c14

Please upload reports for the commit ec02c14 to get more accurate results.

Additional details and impacted files

@@                Coverage Diff                 @@
##           repo-refactor    #1406       +/-   ##
==================================================
+ Coverage          18.81%   38.10%   +19.28%     
==================================================
  Files                263      167       -96     
  Lines              12631     5026     -7605     
  Branches               0      246      +246     
==================================================
- Hits                2377     1915      -462     
+ Misses             10254     3111     -7143     

Flag	Coverage Δ
unittests	38.10% <ø> (+19.28%)	⬆️

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see 116 files with indirect coverage changes

[lockshaw]

Why is the solution not just https://docs.codecov.com/docs/ignoring-paths?

Reviewed 1 of 1 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Bob-Chen222)

[Bob-Chen222]

done.

Reviewable status: 0 of 2 files reviewed, all discussions resolved (waiting on @lockshaw)

[lockshaw]

Reviewed 2 of 2 files at r3, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @Bob-Chen222)

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codecov.yml line 7 at r3 (raw file):

ignore:
  # - "/home/runner/work/FlexFlow/FlexFlow/deps"

Remove comment?

[lockshaw]

Reviewed 1 of 1 files at r4, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Bob-Chen222)