Removed post_create for identityplatform tenant

[melinath]

This code is now unnecessary because we're setting this field automatically on post-create. Part of hashicorp/terraform-provider-google#22214

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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, 15 deletions(-))
google-beta provider: Diff ( 1 file changed, 15 deletions(-))

[modular-magician]

Tests analytics

Total tests: 17
Passed tests: 15
Skipped tests: 2
Affected tests: 0

Click here to see the affected service packages

• identityplatform

🟢 All tests passed!

View the build log

[melinath]

@modular-magician reassign-reviewer

[github-actions]

Hello! I am a robot. Tests will require approval from a repository maintainer to run.

Googlers: For automatic test runs see go/terraform-auto-test-runs.

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[github-actions]

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