ci: Compute coverage for meltano package, not only `tests/`

[edgarrmondragon]

[netlify[bot]]

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[edgarrmondragon]

Ok, I think coverage is now being computed for src/meltano: https://github.com/meltano/meltano/runs/7776394543?check_suite_focus=true#step:8:19

[codecov[bot]]

Codecov Report

Merging #6608 (6ec9e74) into main (e4cf960) will decrease coverage by 14.02%. The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #6608       +/-   ##
===========================================
- Coverage   96.56%   82.54%   -14.03%     
===========================================
  Files          96      180       +84     
  Lines        8539    11483     +2944     
  Branches      408     1565     +1157     
===========================================
+ Hits         8246     9479     +1233     
- Misses        226     1738     +1512     
- Partials       67      266      +199     

Impacted Files	Coverage Δ
tests/meltano/cli/test_install.py
tests/meltano/core/test_project.py
tests/meltano/core/hub/test_meltano_hub_service.py
tests/meltano/core/plugin/singer/test_tap.py
tests/fixtures/cli.py
tests/meltano/cli/test_discover.py
tests/meltano/api/controllers/test_settings.py
tests/support/payload_builder.py
tests/meltano/core/test_config_service.py
tests/meltano/cli/test_remove.py
... and 266 more

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