Remove unused code + Improve GitHub actions

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

[what-the-diff]

PR Summary

• Removal of Redundant Line in Pull Request Template
  The "Fixed issues" line in the Pull Request Template, which was not crucial, has been removed, for less clouded PR creation.

• Dependencies Maintenance Schedule Update
  The schedule on which the software dependencies get updated has been modified. This will ensure that we use more updated and efficient versions of the libraries.

• Workflow Triggers Optimization in the bc.yml file
  Workflows triggers are now ignoring certain files. This means that the workflow will not run for irrelevant changes, saving processing power.

• Workflow Triggers Adjustment in Files
  A bulk of changes were made in the build.yml, composer-require-checker.yml, mutation.yml, rector.yml, and static.yml files. These primarily deal with when and on which branches our automated workflows should run. This ensures we only carry out necessary operations at the right times.

• Upgrade of PHP Version in the rector.yml Workflow
  The PHP version used in the rector.yml workflow has been updated. This leads to improved performance and enhanced security.

• Added Contributor Information in Changelog
  The CHANGELOG.md file has been updated with more detailed contributor information. This provides credit where it's due and offers transparency into who made certain changes.

• Codebase Simplification in UrlGenerator.php
  The variable notSubstitutedArguments and associated code has been deleted from the src/UrlGenerator.php file. This simplifies our codebase, making it easier to maintain.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7839246) 99.49% compared to head (280d319) 99.48%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #136      +/-   ##
============================================
- Coverage     99.49%   99.48%   -0.01%     
  Complexity       85       85              
============================================
  Files             2        2              
  Lines           197      195       -2     
============================================
- Hits            196      194       -2     
  Misses            1        1              

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