Fix certificate_manager_dns_authorization examples to use sweepable names

[roaks3]

fixes hashicorp/terraform-provider-google#14066

I've already deleted the leftover resources causing the issue, so this change just attempts to make these resources sweepable. Note that these particular resource need to be deleted in order, so it remains to be seen how this actually behaves in sweeper runs, but this is at least a step in the right direction.

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• 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).
• Generated Terraform providers, and ran make test and make lint in the generated providers to ensure it passes unit and linter tests.
• Ran relevant acceptance tests using my own Google Cloud project and credentials (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)

[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.

Terraform GA: Diff ( 2 files changed, 44 insertions(+), 44 deletions(-))
Terraform Beta: Diff ( 2 files changed, 44 insertions(+), 44 deletions(-))
TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2521
Passed tests 2250
Skipped tests: 264
Affected tests: 7

Action taken

Found 7 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccComputeTargetSslProxy_update|TestAccDataSourceGoogleServiceAccountIdToken_impersonation|TestAccDataSourceDnsManagedZone_basic|TestAccComputeTargetHttpsProxy_certificateMap|TestAccComputeTargetHttpsProxy_update|TestAccComposerEnvironment_withEncryptionConfigComposer2|TestAccNetworkServicesGateway_update

Get to know how VCR tests work

[modular-magician]

Tests passed during RECORDING mode:
TestAccDataSourceGoogleServiceAccountIdToken_impersonation[Debug log]
TestAccComposerEnvironment_withEncryptionConfigComposer2[Debug log]
TestAccNetworkServicesGateway_update[Debug log]

Tests failed during RECORDING mode:
TestAccComputeTargetSslProxy_update[Error message] [Debug log]
TestAccDataSourceDnsManagedZone_basic[Error message] [Debug log]
TestAccComputeTargetHttpsProxy_certificateMap[Error message] [Debug log]
TestAccComputeTargetHttpsProxy_update[Error message] [Debug log]

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

[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.

Terraform GA: Diff ( 2 files changed, 50 insertions(+), 50 deletions(-))
Terraform Beta: Diff ( 2 files changed, 50 insertions(+), 50 deletions(-))
TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2521
Passed tests 2252
Skipped tests: 264
Affected tests: 5

Action taken

Found 5 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccComputeTargetSslProxy_update|TestAccComputeTargetHttpsProxy_certificateMap|TestAccComputeTargetHttpsProxy_update|TestAccNetworkServicesGateway_update|TestAccDataSourceDnsManagedZone_basic

Get to know how VCR tests work

[modular-magician]

Tests passed during RECORDING mode:
TestAccComputeTargetSslProxy_update[Debug log]
TestAccComputeTargetHttpsProxy_certificateMap[Debug log]
TestAccComputeTargetHttpsProxy_update[Debug log]
TestAccNetworkServicesGateway_update[Debug log]

Tests failed during RECORDING mode:
TestAccDataSourceDnsManagedZone_basic[Error message] [Debug log]

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

[hao-nan-li]

LGTM