[ECS] Unify tags workflow in instance_v2

[lego963]

Summary of the Pull Request

Unify usage of tags in resource/opentelekomcloud_compute_instance_v2

PR Checklist

• Refers to: Unify usage of tags in resources #918
• Tests added/passed.
• Documentation updated.
• Schema updated.

Acceptance Steps Performed

=== RUN   TestAccComputeV2Instance_basic
--- PASS: TestAccComputeV2Instance_basic (127.26s)
=== RUN   TestAccComputeV2Instance_multiSecgroup
--- PASS: TestAccComputeV2Instance_multiSecgroup (109.76s)
=== RUN   TestAccComputeV2Instance_bootFromImage
--- PASS: TestAccComputeV2Instance_bootFromImage (57.53s)
=== RUN   TestAccComputeV2Instance_bootFromVolume
--- PASS: TestAccComputeV2Instance_bootFromVolume (56.39s)
=== RUN   TestAccComputeV2Instance_changeFixedIP
--- PASS: TestAccComputeV2Instance_changeFixedIP (58.67s)
=== RUN   TestAccComputeV2Instance_bootFromVolumeVolume
--- PASS: TestAccComputeV2Instance_bootFromVolumeVolume (83.05s)
=== RUN   TestAccComputeV2Instance_stopBeforeDestroy
--- PASS: TestAccComputeV2Instance_stopBeforeDestroy (68.40s)
=== RUN   TestAccComputeV2Instance_metadata
--- PASS: TestAccComputeV2Instance_metadata (96.51s)
=== RUN   TestAccComputeV2Instance_timeout
--- PASS: TestAccComputeV2Instance_timeout (61.58s)
=== RUN   TestAccComputeV2Instance_autoRecovery
--- PASS: TestAccComputeV2Instance_autoRecovery (91.52s)
=== RUN   TestAccComputeV2Instance_crazyNICs
--- PASS: TestAccComputeV2Instance_crazyNICs (208.25s)
PASS

Process finished with exit code 0

[otc-zuul]

Build succeeded.

• golang-make-test : SUCCESS in 23m 51s
• golang-make-vet : SUCCESS in 7m 27s
• goreleaser-build : SUCCESS in 6m 53s