Remove test bootstrap file

[xepozz]

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

[what-the-diff]

PR Summary

• Removal of the bootstrap Attribute
  The bootstrap attribute, which was previously found in the phpunit.xml.dist file, has been removed. This attribute used to dictate specific prerequisites before running a set of tests, but it's no longer needed in this application.

• Deletion of tests/bootstrap.php File
  The tests/bootstrap.php file, typically used for setting the testing environment up, is no longer in the codebase. This is in line with the removal of the bootstrap attribute mentioned above, making our testing setup simpler and cleaner.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2639357) 94.31% compared to head (49cc460) 94.31%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #181   +/-   ##
=========================================
  Coverage     94.31%   94.31%           
  Complexity      340      340           
=========================================
  Files            40       40           
  Lines           915      915           
=========================================
  Hits            863      863           
  Misses           52       52           

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