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

• Updated Automation Workflow Inclusion Policy
  The code automation workflow file was updated to set certain paths to be ignored during the 'pull request' and 'push' events. This means the workflow will not be triggered when the specified paths are changed in the codebase.

• Adjusted PHP Version Requirement and PHPUnit Dependency
  The requirement for the minimum version of PHP was increased to version 7.3 to ensure smooth functioning. Also, a test-building tool we use, called PHPUnit, had its version upgraded to 9.6, therefore allowing us to benefit from its latest features.

• Standardized 'setUp' Methods with Return Type Declarations
  For consistency and improved readability, the 'setUp' method in several test file structures were modified to include specific return type declarations. This change affects the ActiveDataProviderTest.php, ActiveQueryTest.php, ActiveRecordTest.php, CommandTest.php, ConnectionTest.php, ElasticsearchTargetTest.php, QueryBuilderTest.php, QueryTest.php, and TestCase.php files.

• Increased Assertion Checks in Test Methods
  Salesforce-related methods, like testSearch and testSuggestion in the ActiveRecordTest.php file, and testViaWithCallable in ActiveRecordTestTrait.php, were strengthened by adding more assertion checks. This ensures that these methods are working as expected in all conditions.

• Version-specific Assertion in testRuntimeMappings Method
  The testRuntimeMappings method in QueryTest.php was modified to only run assertions if the Elasticsearch version is 7.11.0 or later, making the tests more efficient by preventing them to run unnecessarily on unsupported versions.

• Cleanup of Unused Files
  Obsolete or non-required files like tests/compatibility.php were removed from the project.

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