remove requirement form zone field in composer config.node_config (#10324)

[kubasieron]

Changed configuration of zone field -now it is required and computed as Composer API stands. That allows creating proper composer v2 envs.

fixes hashicorp/terraform-provider-google#10324

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)

composer: removed `config.node_config.zone` requirement on `google_composer_environment`

[modular-magician]

Hello! I am a robot who works on Magic Modules PRs.

I have detected that you are a community contributor, so your PR will be assigned to someone with a commit-bit on this repo for initial review.

Thanks for your contribution! A human will be with you soon.

@ScottSuarez, please review this PR or find an appropriate assignee.

[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, 36 insertions(+), 7 deletions(-))
Terraform Beta: Diff ( 3 files changed, 66 insertions(+), 30 deletions(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDatasourceGoogleServiceNetworkingPeeredDnsDomain_basic|TestAccComposerEnvironment_basic|TestAccComposerEnvironment_update|TestAccComposerEnvironment_ComposerV2 You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=210629

[modular-magician]

Tests failed during RECORDING mode: TestAccComposerEnvironment_ComposerV2|TestAccComposerEnvironment_basic|TestAccComposerEnvironment_update Please fix these to complete your PR

[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, 36 insertions(+), 7 deletions(-))
Terraform Beta: Diff ( 4 files changed, 68 insertions(+), 32 deletions(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccComposerEnvironment_basic|TestAccComposerEnvironment_update|TestAccComposerEnvironment_ComposerV2|TestAccContainerCluster_withAddons|TestAccContainerCluster_withWorkloadIdentityConfigDeprecation|TestAccContainerCluster_withWorkloadIdentityConfig You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=211192

[ScottSuarez]

I'm confused what is happening here, all the code here is commenting various things out?

[ScottSuarez]

remove commented out code

[kubasieron]

done

[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, 6 insertions(+), 7 deletions(-))
Terraform Beta: Diff ( 3 files changed, 37 insertions(+), 30 deletions(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccContainerNodePool_withGPU|TestAccSqlUser_postgresIAM|TestAccTags You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=211406

[modular-magician]

Tests failed during RECORDING mode: TestAccTags|TestAccSqlUser_postgresIAM Please fix these to complete your PR