Add fields to support stateful cookie-based affinity

[ahmed-laiq]

Add Terraform support for configuring stateful cookie-based affinity. It is added to both backend service and regional backend service. Connections bearing the same cookie will be served by the same backend VM while that VM remains healthy, as long as the cookie has not expired.
Fixes: hashicorp/terraform-provider-google#19647

• Searched through the issue tracker for an open issue that this either resolves or contributes.
• 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). - read only field
• 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)

compute: added enum STATEFUL_COOKIE_AFFINITY and `strong_session_affinity_cookie` field to `google_compute_backend_service` and `google_compute_region_backend_service` resource

[github-actions]

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@c2thorn, 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 ( 4 files changed, 571 insertions(+), 6 deletions(-))
google-beta provider: Diff ( 6 files changed, 684 insertions(+), 6 deletions(-))
terraform-google-conversion: Diff ( 2 files changed, 162 insertions(+))

Missing test report

Your PR includes resource fields which are not covered by any test.

Resource: google_compute_backend_service (179 total tests)
Please add an acceptance test which includes these fields. The test should include the following:

resource "google_compute_backend_service" "primary" {
  strong_session_affinity_cookie {
    path = # value needed
  }
}

Resource: google_compute_region_backend_service (143 total tests)
Please add an acceptance test which includes these fields. The test should include the following:

resource "google_compute_region_backend_service" "primary" {
  strong_session_affinity_cookie {
    path = # value needed
  }
}

[modular-magician]

Tests analytics

Total tests: 1017
Passed tests: 941
Skipped tests: 74
Affected tests: 2

Click here to see the affected service packages

• compute

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

• TestAccComputeBackendService_backendServiceStatefulSessionAffinityExample
• TestAccComputeRegionBackendService_regionBackendServiceIlbStatefulSessionAffinityExample

Get to know how VCR tests work

[modular-magician]

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

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

---

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

View the build log or the debug log for each test

[c2thorn]

LGTM