Fix Xdebug Installation Issue

[jakejackson1]

Description

The latest Xdebug dropped support for PHP7.4 and below. This PR selectively enabled Xdebug so the automated tests can pass.

Testing instructions

Automated tests shoudl all pass

Screenshots

Checklist:

• [x] 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 #1436 (c603ded) into development (289b512) will increase coverage by 15.31%. The diff coverage is n/a.

@@                Coverage Diff                 @@
##             development    #1436       +/-   ##
==================================================
+ Coverage          77.98%   93.30%   +15.31%     
==================================================
  Files                243       57      -186     
  Lines              10067     1464     -8603     
  Branches             370      370               
==================================================
- Hits                7851     1366     -6485     
+ Misses              2208       90     -2118     
  Partials               8        8               

Impacted Files	Coverage Δ
src/Helper/Fonts/FlushCache.php
src/Model/Model_Uninstall.php
src/Controller/Controller_Settings.php
src/View/html/PDF/page_title.php
src/View/html/PDF/entry_no_valid_pdf.php
src/Helper/Fields/Field_Email.php
src/Helper/Helper_Options_Fields.php
src/Exceptions/GravityPdfRuntimeException.php
src/Helper/Fields/Field_Textarea.php
src/View/View_Form_Settings.php
... and 176 more

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