[FEATURE] Enhance the safegard when deleting top queries records

[ansjcy]

Is your feature request related to a problem?

We rely on the isTopQueriesIndex function when deleting outdated query insights data. And that function only uses index name to decide if it is a query insights index. This is very dangerous and we could be deleting customer data. Think about use cases when:

• Customers create an index that can matches the index pattern
• We are adding more features in the exporter in the future and changed the isTopQueriesIndex matching and it somhow returns true for non query insights indices. We will be deleting customer data

What solution would you like?

Additional safegard should be added like, adding certain metadata to indicate "this is a query insights data".

What alternatives have you considered?

A clear and concise description of any alternative solutions or features you've considered.

Do you have any additional context?

Add any other context or screenshots about the feature request here.

[ansjcy]

This is fixed in #210