Test component audit event row count and diff count checks for Sample and Source delete and move

[cnathe]

Rationale

Expanding on recent AuditLogHelper checks for audit event row/diff counts on actions like sample/source bulk update and details update, this PR adds similar checks within the test components for deleting and moving samples and sources.

Related Pull Requests

• Test component audit event row count and diff count checks for Sample and Source delete and move testAutomation#2481
• Test component audit event row count and diff count checks for Sample and Source delete and move #6745
• https://github.com/LabKey/limsModules/pull/1461

Changes

• ExperimentServiceImpl.java: Updated the moveDataClassObjects method to include a check ensuring that an audit event is only created if transaction.getAuditEvent() is null.
• ExperimentServiceImpl.java: Modified the moveAssayRuns method to add the same safeguard, preventing duplicate audit event creation during assay run moves.
• SampleTypeServiceImpl.java: Adjusted the moveSamples method to include the check for an existing audit event before creating a new one.