Use Codecov action for PHP Coverage Report

[jakejackson1]

Description

Resolves missing code coverage report on the PHP GitHub actions.

Testing instructions

Automated tests

Screenshots

Checklist:

• [ ] I've tested the code.
• [ ] My code is easy to read, follow, and understand
• [ ] My code follows the accessibility standards.
• [ ] My code has proper inline documentation / docblocks.

Additional Comments

[codecov[bot]]

Codecov Report

Merging #1396 (d918a69) into development (90cbaac) will decrease coverage by 16.01%. The diff coverage is n/a.

@@                Coverage Diff                 @@
##             development    #1396       +/-   ##
==================================================
- Coverage          93.30%   77.29%   -16.02%     
- Complexity             0     2893     +2893     
==================================================
  Files                 57      243      +186     
  Lines               1464    10099     +8635     
  Branches             370      370               
==================================================
+ Hits                1366     7806     +6440     
- Misses                90     2285     +2195     
  Partials               8        8               

Impacted Files	Coverage Δ
src/Helper/Fields/Field_Product.php	64.00% <0.00%> (ø)
src/View/html/Actions/action_buttons.php	85.71% <0.00%> (ø)
src/View/View_Uninstaller.php	0.00% <0.00%> (ø)
src/Helper/Helper_Singleton.php	92.30% <0.00%> (ø)
src/View/View_Form_Settings.php	100.00% <0.00%> (ø)
src/Helper/Helper_Interface_Actions.php	0.00% <0.00%> (ø)
src/Controller/Controller_Activation.php	0.00% <0.00%> (ø)
src/View/html/PDF/form_title.php	66.66% <0.00%> (ø)
src/Model/Model_Uninstall.php	60.37% <0.00%> (ø)
src/templates/config/focus-gravity.php	0.00% <0.00%> (ø)
... and 176 more

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