Backport of Backend/COS: remove COS object lock tag either when unlock remote state into v1.2

[teamterraform]

Backport

This PR is auto-generated from #31223 to be assessed for backporting due to the inclusion of the label 1.2-backport.

The below text is copied from the body of the original PR.

---

When running command terraform force-unlock , the remote state file will be removed as expect. However, the tencentcloud-terraform-lock tag will not removed at the same time in some unexpected program exit cases. Creating this PR is purpose to ensure the tag removed to get rid of impact of next terraform operation.

Here shows the unit test output:

$ TF_ACC=1 go test -v ./internal/backend/remote-state/cos

=== RUN   TestStateFile
=== PAUSE TestStateFile
=== RUN   TestRemoteClient
=== PAUSE TestRemoteClient
=== RUN   TestRemoteClientWithPrefix
=== PAUSE TestRemoteClientWithPrefix
=== RUN   TestRemoteClientWithEncryption
=== PAUSE TestRemoteClientWithEncryption
=== RUN   TestRemoteLocks
=== PAUSE TestRemoteLocks
=== RUN   TestBackend
=== PAUSE TestBackend
=== RUN   TestBackendWithPrefix
=== PAUSE TestBackendWithPrefix
=== RUN   TestBackendWithEncryption
=== PAUSE TestBackendWithEncryption
=== CONT  TestBackendWithPrefix
=== CONT  TestStateFile
=== RUN   TestStateFile/_default.tfstate_default
=== CONT  TestBackend
=== RUN   TestStateFile/_test.tfstate_default
=== RUN   TestStateFile/_test.tfstate_dev
=== RUN   TestStateFile/terraform/test_default.tfstate_default
=== CONT  TestRemoteLocks
=== CONT  TestRemoteClientWithEncryption
=== CONT  TestRemoteClientWithPrefix
=== CONT  TestRemoteClient
=== CONT  TestBackendWithEncryption
=== CONT  TestBackend
=== CONT  TestBackendWithPrefix
=== CONT  TestRemoteClientWithPrefix
=== CONT  TestBackendWithEncryption
=== CONT  TestRemoteClient
=== RUN   TestStateFile/terraform/test_test.tfstate_default
=== CONT  TestRemoteClientWithEncryption
=== CONT  TestRemoteLocks
=== RUN   TestStateFile/terraform/test_test.tfstate_dev
--- PASS: TestStateFile (0.00s)
    --- PASS: TestStateFile/_default.tfstate_default (0.00s)
    --- PASS: TestStateFile/_test.tfstate_default (0.00s)
    --- PASS: TestStateFile/_test.tfstate_dev (0.00s)
    --- PASS: TestStateFile/terraform/test_default.tfstate_default (0.00s)
    --- PASS: TestStateFile/terraform/test_test.tfstate_default (0.00s)
    --- PASS: TestStateFile/terraform/test_test.tfstate_dev (0.00s)
=== CONT  TestBackendWithPrefix
=== CONT  TestBackendWithEncryption
=== CONT  TestBackend
--- PASS: TestRemoteClientWithPrefix (1.79s)
--- PASS: TestRemoteClientWithEncryption (1.84s)
--- PASS: TestRemoteClient (1.90s)
--- PASS: TestRemoteLocks (3.25s)
=== CONT  TestBackend
=== CONT  TestBackendWithEncryption
=== CONT  TestBackendWithPrefix
=== CONT  TestBackend
    testing.go:300: TestBackend: testing state locking for *cos.Backend
=== CONT  TestBackendWithEncryption
    testing.go:300: TestBackend: testing state locking for *cos.Backend
=== CONT  TestBackendWithPrefix
    testing.go:300: TestBackend: testing state locking for *cos.Backend
=== CONT  TestBackend
    testing.go:300: TestBackend: testing state locking for *cos.Backend
--- PASS: TestBackendWithEncryption (6.95s)
--- PASS: TestBackendWithPrefix (7.01s)
--- PASS: TestBackend (9.15s)
PASS
ok      github.com/hashicorp/terraform/internal/backend/remote-state/cos        9.532s

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[github-actions]

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