Fix iam files with snakecase back to camelcase

[iyabchen]

In previous PR #5594, it turns asset name from camel case to snake case, which is incorrect for a few resources including private ca pool. This PR reverts that and add a handwritten file for servicemanagent service iam.

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).
• 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).
• 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)

[modular-magician]

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

Diff report:

Terraform Beta: Diff ( 1 file changed, 18 insertions(+), 18 deletions(-))
TF Validator: Diff ( 6 files changed, 11 insertions(+), 25 deletions(-))

[melinath]

Ah, so it looks like the issue with servicemanagement is that the id_format and import_format were specified incorrectly. They should be services/{{service_name}}. Since the resource is excluded, this is only used to generate the iam resource... I think it should be safe to update and then it doesn't need to be handwritten. If there are any follow-on issues (like failing tests) I can advise on how to fix them.

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 2 files changed, 7 insertions(+), 7 deletions(-))
Terraform Beta: Diff ( 2 files changed, 7 insertions(+), 7 deletions(-))
TF Validator: Diff ( 5 files changed, 10 insertions(+), 10 deletions(-))

[melinath]

Okay, it looks like there's some remaining references to serviceName which seem to be coming from the self_link in products/servicemanagement/api.yaml.

The self_link in api.yaml will need to be updated to use snake case as well; I think that should finish this PR.

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccApigeeEnvironmentIamBindingGenerated|TestAccApigeeEnvironmentIamMemberGenerated|TestAccApigeeEnvironmentIamPolicyGenerated|TestAccServiceManagementServiceIamBindingGenerated|TestAccServiceManagementServiceIamMemberGenerated|TestAccServiceManagementServiceIamPolicyGenerated|TestAccCloudbuildWorkerPool_basic|TestAccContainerNodePool_withInvalidUpgradeSettings You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=241810

[modular-magician]

Tests failed during RECORDING mode: TestAccCloudbuildWorkerPool_basic|TestAccServiceManagementServiceIamBindingGenerated|TestAccServiceManagementServiceIamMemberGenerated|TestAccServiceManagementServiceIamPolicyGenerated|TestAccContainerNodePool_withInvalidUpgradeSettings Please fix these to complete your PR

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 3 files changed, 50 insertions(+), 51 deletions(-))
Terraform Beta: Diff ( 2 files changed, 10 insertions(+), 11 deletions(-))
TF Validator: Diff ( 5 files changed, 13 insertions(+), 13 deletions(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDatasourceGoogleServiceNetworkingPeeredDnsDomain_basic|TestAccApigeeEnvironmentIamBindingGenerated|TestAccApigeeEnvironmentIamPolicyGenerated|TestAccCloudbuildWorkerPool_basic|TestAccContainerNodePool_withInvalidUpgradeSettings You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=241813

[modular-magician]

Tests failed during RECORDING mode: TestAccCloudbuildWorkerPool_basic|TestAccContainerNodePool_withInvalidUpgradeSettings Please fix these to complete your PR

[melinath]

LGTM