Fix inconsistent result after apply error when adding CLOUD_IAM_GROUP users with capitalized domain names.

[tmgho122]

Fixes hashicorp/terraform-provider-google#26509

• Updated DiffSuppressFunc for user name to account for lowercasing of domain names for MySQL users of type CLOUD_IAM_GROUP.
• Updated unit tests to cover scenario where MySQL CLOUD_IAM_GROUP users have capitalized domain name while ensuring no regressions for Postgres.

cloudsql: fixed inconsistent result after apply error when adding `users` of type `CLOUD_IAM_GROUP` with capitalized domain names for MySQL

[github-actions]

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit cba522b:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	2 files changed, 128 insertions(+), 5 deletions(-)
google-beta provider	View Diff	2 files changed, 128 insertions(+), 5 deletions(-)

Test report

Important

Manual Verification Required

VCR cannot automatically execute the following tests added in this PR. Please verify them manually:

🔴 TestAccSqlUser_iamGroupUser_capitalizedHostName
🔴 TestAccSqlUser_postgres_iamGroupUser

Analytics

Total Tests	Passed	Skipped	Affected
154	118	29	7

Affected Service Packages

• sql

Learn how VCR tests work

---

Step 1: Replaying Mode

Action taken

Found 7 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit.

Click here to see the affected tests

• TestAccSqlUser_mysql_createUserWithDatabaseRoles
• TestAccSqlUser_mysql_updateUserWithDatabaseRoles
• TestAccSqlUser_password_wo
• TestAccSqlUser_postgres
• TestAccSqlUser_postgresAbandon
• TestAccSqlUser_postgresIAM
• TestAccSqlUser_postgres_updateUserWithDatabaseRoles

View the replaying VCR build log

---

Step 2: Recording Mode

Recording Mode	Replaying Rerun	Test Name
✅ Log	✅	TestAccSqlUser_mysql_createUserWithDatabaseRoles
✅ Log	✅	TestAccSqlUser_mysql_updateUserWithDatabaseRoles
✅ Log	✅	TestAccSqlUser_password_wo
✅ Log	✅	TestAccSqlUser_postgres
✅ Log	✅	TestAccSqlUser_postgresAbandon
✅ Log	✅	TestAccSqlUser_postgresIAM
✅ Log	✅	TestAccSqlUser_postgres_updateUserWithDatabaseRoles

Caution

Issues requiring attention before PR completion

🔴 Manual Verification Required: New tests were added that are skipped in presubmit tests. See the "Manual Verification Required" section at the top for details.

Please address these issues to complete your PR. If you believe these detections are incorrect or unrelated to your change, please raise the concern with your reviewer.

View the recording VCR build log or the debug logs folder for detailed results.

@tmgho122, @malhotrasagar2212 VCR tests complete for cba522b!