Raise min version to PHP 7.3, check compatibility PHP 8.3.

[terabytesoftw]

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

[what-the-diff]

PR Summary

• Ignore Paths in PR and Push Events
  Some paths in our project have been marked to be disregarded in pull request and push events, decreasing irrelevant warnings in our automatic process.

• Packages and PHP Version Updates
  We updated the required software packages and the minimum PHP version in our composer.json file, ensuring the latest features & security enhancements.

• Test File Method Signature Updates
  Various testing files had updates in their setUp() and tearDown() methods. These methods set up and conclude our tests, now their signatures (how they're invoked) are renewed to ensure better testing alignment and practices. This includes tests for active data provider, fixtures, active records, relations, batch queries, caching, command, database, session, and migrations.

• Removal of compatibility.php
  The bootstrap.php file no longer includes compatibility.php and it has been deleted, cleaning up unnecessary elements in our repository.

• Update to Mongo Tests
  The methods setUp() and tearDown() in the MongoDB test files have now included return types. This specifies what kind of result the methods should return, making the code more understandable and less error-prone. Also, the test assertions using assertContains were replaced with assertStringContainsString for better string occurrence testing.

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