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* Create libpqToPGX feature toggle * Refactor PostgreSQL datasource to support PGX with feature toggle - Updated `ProvideService` to accept feature toggles for enabling PGX. - Modified integration tests to use the new PGX connection method. - Introduced new functions for handling PGX connections and queries. - Enhanced TLS configuration handling for PostgreSQL connections. - Updated existing tests to ensure compatibility with PGX and new connection methods. * Update PostgreSQL datasource to enhance connection pooling and error handling - Increased `MaxOpenConns` to 10 in integration tests for improved connection management. - Refactored connection handling in `newPostgresPGX` to return a connection pool instead of a single connection. - Updated health check error handling to utilize context and feature toggles for better error reporting. - Adjusted `DisposePGX` method to close the connection pool properly. - Enhanced query execution to acquire connections from the pool, ensuring efficient resource usage. * Cleanup * Revert postgres_test unnecessary changes * Rename feature toggle from `libpqToPGX` to `postgresDSUsePGX` * Add null check to dispose method * Fix lint issues * Refactor connection string generation * Address comment in health check file * Rename p to pool * Refactor executeQueryPGX and split into multiple functions * Fix lint issues * The returning error message from PGX is enough no need to separate the error code. * Move TLS handling to newPostgresPGX function * Disable ssl for integration tests * Use MaxIdleConns option * Remove old feature toggle * Rename`generateConnectionConfigPGX` to `generateConnectionStringPGX` * Add back part of the error messages * Don't show max idle connections option when PGX enabled * Address comments from Sriram * Add back Sriram's changes * PostgreSQL: Rework tls manager to use temporary files instead (#105330) * Rework tls manager to use temporary files instead * Lint and test fixes * Update pkg/tsdb/grafana-postgresql-datasource/postgres.go Co-authored-by: Ivana Huckova <30407135+ivanahuckova@users.noreply.github.com> * Update betterer --------- Co-authored-by: Ivana Huckova <30407135+ivanahuckova@users.noreply.github.com> --------- Co-authored-by: Ivana Huckova <30407135+ivanahuckova@users.noreply.github.com>