[🍒] Add TRANSACTION_ISOLATION_LEVEL config in cloudsql-postgres and cloudsql-mysql plugins for 1.11

[vishwasvaidya-cloudsufi]

[🍒]

🍒 [cherrypick]

PR : (#675)

Description:

Add TRANSACTION_ISOLATION_LEVEL config in cloudsql-postgres and cloudsql-mysql plugins

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[gemini-code-assist]

Code Review

This pull request introduces support for configuring the transaction isolation level in CloudSQL MySQL and CloudSQL PostgreSQL plugins, updating documentation, widget configurations, and source configurations. The review feedback highlights that both CloudSQLMySQLSource and CloudSQLPostgreSQLSource should honor the transaction isolation level configured in the connection when useConnection is enabled, rather than falling back to the local source configuration or default value.

[gemini-code-assist]

When useConnection is enabled, the source should honor the transaction isolation level configured in the connection rather than falling back to the source's local configuration or default value. Currently, connection.getTransactionIsolationLevel() is ignored.

    @Override
    public String getTransactionIsolationLevel() {
      if (useConnection != null && useConnection && connection != null) {
        return connection.getTransactionIsolationLevel();
      }
      return transactionIsolationLevel != null ? transactionIsolationLevel : DEFAULT_TRANSACTION_ISOLATION_LEVEL;
    }

[gemini-code-assist]

When useConnection is enabled, the source should honor the transaction isolation level configured in the connection rather than falling back to the source's local configuration or default value. Currently, connection.getTransactionIsolationLevel() is ignored.

    @Override
    public String getTransactionIsolationLevel() {
      if (useConnection != null && useConnection && connection != null) {
        return connection.getTransactionIsolationLevel();
      }
      return transactionIsolationLevel != null ? transactionIsolationLevel : DEFAULT_TRANSACTION_ISOLATION_LEVEL;
    }