[receiver/sqlquery] sqlserver integration tests, improved coverage

[Grandys]

Description

Mainly added test for sqlserver, plus added coverage for logs (as requested in comment)

Link to tracking issue

Fixes #29695

Testing

Main changes:

• Added metrics tests for SqlServer
• Covered MySql, SqlServer and Oracle for logs

Improvements:

• To avoid repetitions, changed approach to "parameterized" tests - run the same test flow for different database engines (for logs only).
• Do not hardcode "localhost" and host port, get these values from testcontainers.
• Replaced inserting test values into the database from running CLI commands in the container to executing SQL commands.
• Updated Oracle init script to use otel schema instead of sys.

Important: For Oracle and SQL Server, tests are skipped (tested locally) - I expect them to fail due to #27577 (which was not fixed but closed due to inactivity).