GCP compute instance template fields are ForceNew

[dghubble]

• Compute instance template fields should ForceNew, GCP doesn't support update in place
• Fix "doesn't support update" error when trying to change the instance termination action

Release Note Template for Downstream PRs (will be copied)

compute: Fixed permadiff for `instance_termination_action` in `google_compute_instance_template`

Similar: #3493
Related: hashicorp/terraform-provider-google#6317

[modular-magician]

Oops! It looks like no changelog entry is attached to this PR. Please include a release note block in the PR body, as described in https://github.com/GoogleCloudPlatform/magic-modules/blob/master/.ci/RELEASE_NOTES_GUIDE.md:

```release-note:TYPE
Release note
```

[modular-magician]

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[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 1 file changed, 1 insertion(+))
Terraform Beta: Diff ( 1 file changed, 1 insertion(+))
TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2129
Passed tests 1893
Skipped tests: 227
Failed tests: 9

Action taken

Triggering VCR tests in RECORDING mode for the tests that failed during VCR. Click here to see the failed tests

TestAccComputeInstance_networkPerformanceConfig|TestAccComputeInstance_soleTenantNodeAffinities|TestAccComputeGlobalForwardingRule_internalLoadBalancing|TestAccCloudFunctions2Function_fullUpdate|TestAccCloudfunctions2function_cloudfunctions2BasicAuditlogsExample|TestAccCloudfunctions2function_cloudfunctions2BasicGcsExample|TestAccCloudRunService_cloudRunServiceStaticOutboundExample|TestAccSqlUser_mysqlDisabled|TestAccPrivatecaCertificateAuthority_privatecaCertificateAuthoritySubordinateExample

[modular-magician]

Tests passed during RECORDING mode:
TestAccCloudFunctions2Function_fullUpdate[view]
TestAccCloudfunctions2function_cloudfunctions2BasicAuditlogsExample[view]
TestAccCloudfunctions2function_cloudfunctions2BasicGcsExample[view]
TestAccSqlUser_mysqlDisabled[view]
TestAccPrivatecaCertificateAuthority_privatecaCertificateAuthoritySubordinateExample[view]

Tests failed during RECORDING mode:
TestAccComputeInstance_networkPerformanceConfig[view]
TestAccComputeInstance_soleTenantNodeAffinities[view]
TestAccComputeGlobalForwardingRule_internalLoadBalancing[view]
TestAccCloudRunService_cloudRunServiceStaticOutboundExample[view]

Please fix these to complete your PR
View the build log or the debug log for each test

[ScottSuarez]

lgtm ~