Fix Terraform updates for instances with Google ML Integration enabled

[rsm3171990]

This pull request addresses a bug where Terraform would fail to include the required database version when updating metadata for instances with the enable_google_ml_integration flag set to true. This resulted in API rejection of those update requests. Added acctest and verified that the change passes locally.

Fixes hashicorp/terraform-provider-google#17819

Release Note Template for Downstream PRs (will be copied)

sql: fixed issues with updating the `enable_google_ml_integration` field in `google_sql_database_instance` resource

[github-actions]

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@NickElliot, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[modular-magician]

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

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 2 files changed, 17 insertions(+), 7 deletions(-))
google-beta provider: Diff ( 2 files changed, 17 insertions(+), 7 deletions(-))

[modular-magician]

Tests analytics

Total tests: 93
Passed tests: 77
Skipped tests: 14
Affected tests: 2

Click here to see the affected service packages

• sql

Action taken

Found 2 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccSqlDatabaseInstance_EnableGoogleMlIntegration|TestAccSqlUser_postgresIAM

Get to know how VCR tests work

[modular-magician]

$\textcolor{green}{\textsf{Tests passed during RECORDING mode:}}$
TestAccSqlDatabaseInstance_EnableGoogleMlIntegration[Debug log]

$\textcolor{green}{\textsf{No issues found for passed tests after REPLAYING rerun.}}$

---

$\textcolor{red}{\textsf{Tests failed during RECORDING mode:}}$
TestAccSqlUser_postgresIAM[Error message] [Debug log]

$\textcolor{red}{\textsf{Please fix these to complete your PR.}}$
View the build log or the debug log for each test

[rsm3171990]

From the comment in an earlier PR:
It looks like the SQL user failure is known and probably unrelated: hashicorp/terraform-provider-google#16704

[NickElliot]

/gcbrun

[NickElliot]

rerunning to verify with test skipped

[modular-magician]

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

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 2 files changed, 17 insertions(+), 7 deletions(-))
google-beta provider: Diff ( 2 files changed, 17 insertions(+), 7 deletions(-))

[modular-magician]

Tests analytics

Total tests: 93
Passed tests: 78
Skipped tests: 15
Affected tests: 0

Click here to see the affected service packages

• sql

$\textcolor{green}{\textsf{All tests passed!}}$
View the build log

[NickElliot]

LGTM