add support for IAM authentication to google_sql_user for #7512

[slevenick]

Upstream: hashicorp/terraform-provider-google#8017

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

sql: added support for setting the `type` field on `google_sql_user` to support IAM authentication

[google-cla]

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[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 2 files changed, 70 insertions(+), 4 deletions(-))
Terraform Beta: Diff ( 2 files changed, 70 insertions(+), 4 deletions(-))

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=163305"

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDataSourceComposerEnvironment_basic|TestAccDataSourceGoogleSQLCaCerts_basic|TestAccDataSourceStorageBucketObjectContent_Basic|TestAccDataSourceSpannerInstance_basic|TestAccDataSourceSqlDatabaseInstance_basic|TestAccActiveDirectoryDomainTrust_activeDirectoryDomainTrustBasicExample|TestAccBillingBudget_billingBudgetLastperiodExample|TestAccBillingBudget_billingBudgetFilterExample|TestAccBillingBudget_billingBudgetNotifyExample|TestAccBillingBudget_billingBudgetBasicExample|TestAccBigqueryDataTransferConfig|TestAccCloudRunService_cloudRunServiceSqlExample|TestAccCloudSchedulerJob_schedulerJobHttpExample|TestAccComposerEnvironment_withUpdateOnCreate|TestAccOSLoginSSHPublicKey_osLoginSshKeyExpiry|TestAccSQLDatabase_sqlDatabaseBasicExample|TestAccSqlDatabaseInstance_basicSecondGen|TestAccSqlDatabaseInstance_basicMSSQL|TestAccSqlDatabaseInstance_dontDeleteDefaultUserOnReplica|TestAccSqlDatabaseInstance_settings_basic|TestAccSqlDatabaseInstance_settings_deletionProtection|TestAccSqlDatabaseInstance_replica|TestAccSqlDatabaseInstance_slave|TestAccSqlDatabaseInstance_maintenance|TestAccSqlDatabaseInstance_highAvailability|TestAccSqlDatabaseInstance_diskspecs|TestAccSqlDatabaseInstance_settings_upgrade|TestAccSpannerDatabase_basic|TestAccSqlDatabaseInstance_settingsDowngrade|TestAccSqlDatabaseInstance_authNets|TestAccSqlDatabaseInstance_multipleOperations|TestAccSqlDatabaseInstance_basic_with_user_labels|TestAccSqlUser_postgresIAM|TestAccSqlDatabaseInstance_PointInTimeRecoveryEnabled|TestAccSqlDatabaseInstance_withPrivateNetwork|TestAccSqlDatabase_update|TestAccSqlDatabase_basic|TestAccSqlClientCert_postgres|TestAccSqlUser_postgresAbandon|TestAccSqlUser_postgres|TestAccSqlClientCert_mysql You can view the result here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=163394"

[google-cla]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

Note to project maintainer: There may be cases where the author cannot leave a comment, or the comment is not properly detected as consent. In those cases, you can manually confirm consent of the commit author(s), and set the cla label to yes (if enabled on your project).

ℹ️ Googlers: Go here for more info.

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 3 files changed, 102 insertions(+), 4 deletions(-))
Terraform Beta: Diff ( 3 files changed, 102 insertions(+), 4 deletions(-))

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=163463"

[slevenick]

/gcbrun

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 3 files changed, 102 insertions(+), 4 deletions(-))
Terraform Beta: Diff ( 4 files changed, 103 insertions(+), 5 deletions(-))

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=163470"

[nat-henderson]

huh, cool, glad they added that!