Fix sql VCR test failure in replaying

[modular-magician]

This should prevent TestAccSqlDatabaseInstance_mysqlMajorVersionUpgrade from failing in VCR replaying mode. The test takes about 30 mins to run in recording.

Reason that TestAccSqlDatabaseInstance_mysqlMajorVersionUpgrade failed in VCR replaying currently:
The test is using a config testGoogleSqlDatabaseInstance_basic2 which does have the name set.
If the name of the sql instance is not explicitly specified, Terraform will randomly generate one during creation, and therefore it creates randomness and makes the test failed in replaying.

The other place testGoogleSqlDatabaseInstance_basic2 used is in test TestAccSqlDatabaseInstance_basicInferredName. The test is intentionally set up to test if the name can be generated when it's not specified by users and it's skipped in VCR.

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Derived from GoogleCloudPlatform/magic-modules#6625