fix: [~] codecov reports with flags

[eruizalo]

Description

Adding flag management for codecov reports

Related Issue

None

Motivation and Context

It doesn't seem right at codecov after adding flags: I couldn't see any flags at main and some files went missing

How Has This Been Tested?

Not tested

• This pull request contains appropriate tests?

[codecov]

Codecov Report

Merging #196 (1f42351) into main (bb897a7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #196   +/-   ##
=======================================
  Coverage   95.99%   95.99%           
=======================================
  Files          49       49           
  Lines         798      798           
  Branches        9        9           
=======================================
  Hits          766      766           
  Misses         32       32           

Flag	Coverage Δ
3.0.x	?
3.1.x	?
3.2.x	?
spark-3.0.x	94.82% <ø> (?)
spark-3.1.x	95.97% <ø> (?)
spark-3.2.x	95.97% <ø> (?)

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

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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