Add unit tests for 6 more JDBC query DAOs

[currenjin]

What's this PR about?

Continues improving JDBC storage plugin test coverage by adding unit tests for 6 more query DAOs.

With the previous rounds (#13800, #13802), DAO test coverage goes from 12/39 (31%) to 18/39 (46%). All query DAOs with buildSQL-style protected methods are now covered.

Tests

DAO	Tests
JDBCAggregationQueryDAO	TABLE_COLUMN + time bucket range, subquery with group by, ASC/DESC order, additional conditions
JDBCRecordsQueryDAO	TABLE_COLUMN, entity_id + time_bucket range, ASC/DESC order with limit
JDBCHierarchyQueryDAO	service relations (TABLE_COLUMN + limit), instance relations (bidirectional OR with parameter binding)
JDBCTagAutoCompleteQueryDAO	query keys (distinct + tag type + limit), query values (tag key + tag type)
JDBCEBPFProfilingDataDAO	TABLE_COLUMN, schedule ID IN clause, upload time range
JDBCEBPFProfilingScheduleDAO	TABLE_COLUMN, task ID filter, WHERE clause structure

All 24 new test cases pass locally.

Which issue does this PR relate to?

N/A - test coverage improvement.