Add support for configuring the Pod Snapshots feature

[saketjajoo]

The GKE Pod Snapshots feature is rolled out in a Public Preview mode. This change aims to update the terraform provider to include the config to enable/disable this feature when using the beta APIs.

Internal Ref: b/445922392.
Cross Ref: #15262 - this PR was created before the API change was rolled out to get an initial review and got closed due to inactivity. Now that the API change is rolled out in beta (public preview), I'm create this PR to resume the work.

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container: added `pod_snapshot_config` field to `google_container_cluster` resource

[github-actions]

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[saketjajoo]

/cc @CoderSherlock

[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, 2 insertions(+))
google-beta provider: Diff ( 3 files changed, 42 insertions(+))

Missing doc report (experimental)

The following resources have fields missing in documents.

• google_container_cluster
  • Expected Document Path: /website/docs/r/container_cluster.html.markdown
  • Fields: [addons_config.pod_snapshot_config.enabled]

[modular-magician]

Tests analytics

Total tests: 272
Passed tests: 256
Skipped tests: 15
Affected tests: 1

Click here to see the affected service packages

• container

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccContainerCluster_withAddons

Get to know how VCR tests work

[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccContainerCluster_withAddons [Debug log]

🟢 No issues found for passed tests after REPLAYING rerun.

---

🟢 All tests passed!

View the build log or the debug log for each test

[CoderSherlock]

/LGTM