Fix and improve tests

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[what-the-diff]

PR Summary

• Refined migration tests
  The outdated instruction in AbstractMigratorTest.php, that ran a now-unnecessary downward migration, has been removed for the sake of efficiency.

• Clearing additional tables in MSSQL and MySQL
  In both the MssqlFactory.php and MysqlFactory.php files, 'person', 'book', and 'chapter' tables have been added to the clearDatabase method. This means when the clear database function is used, data in these tables will be erased leading to a fresher start point for new data entries.

• Adding 'PERSON' table clearance for Oracle
  In a similar fashion, the OracleFactory.php file now includes the 'PERSON' table in the clearDatabase method. This adjustment ensures parity of the clear database operation across various database systems.

• Enhancements to SQLite database clearance
  Code changes made to SqLiteFactory.php now store the result of the createCommand function in a variable, which is then used to drop tables in the clearDatabase method. This enhancement promotes code reusability, which often leads to more efficient and easier-to-maintain software.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2ef6724) 99.79% compared to head (43ec793) 99.79%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #229   +/-   ##
=========================================
  Coverage     99.79%   99.79%           
  Complexity      290      290           
=========================================
  Files            19       19           
  Lines           960      960           
=========================================
  Hits            958      958           
  Misses            2        2           

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