sql: Add enhanced_query_insights_enabled to insights_config

[zjalicf]

Adds support for the enhancedQueryInsightsEnabled API field in google_sql_database_instance.settings.insights_config.

This field enables the Query Insights Enhanced feature for Enterprise Plus instances. Currently, it is not possible to change this field via terraform, but it is available in REST API doc:

Fixes: hashicorp/terraform-provider-google#22281

sql: added `enhanced_query_insights_enabled` field to `google_sql_database_instance` resource `insights_config` block

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[zjalicf]

Looks like github worklow uses old go client. This was added only 3 weeks ago:

https://github.com/googleapis/google-api-go-client/blame/29bd84381608db3db0385bd8f4544af458df7329/sqladmin/v1beta4/sqladmin-gen.go#L3068

not sure what is the best way forward here, other than updating CI/CD

[SirGitsalot]

FYI #16270