Remove cluster update validation for primary to secondary

[199201shubhamsahu]

Remove cluster update validation for cluster_type update from PRIMARY to SECONDARY as it is handled by the backend API

Verified with terraform apply
Error: Error updating Cluster "projects/$projectName/locations/$locationName/clusters/primary-cluster": googleapi: Error 400: The request was invalid: updating field cluster_type is not supported (current value: PRIMARY, specified value: SECONDARY)
│ Details:
│ [
│ {
│ "@type": "type.googleapis.com/google.rpc.DebugInfo",
│ "detail": "generic::invalid_argument: The request was invalid: updating field cluster_type is not supported (current value: PRIMARY, specified value: SECONDARY)",
│ "stackEntries": [
| ......
│ ]

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[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 ( 1 file changed, 5 deletions(-))
google-beta provider: Diff ( 1 file changed, 5 deletions(-))

[modular-magician]

Tests analytics

Total tests: 65
Passed tests: 61
Skipped tests: 4
Affected tests: 0

Click here to see the affected service packages

• alloydb

$\textcolor{green}{\textsf{All tests passed!}}$
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