Add Google HC Datasource

[upodroid]

Fixes: hashicorp/terraform-provider-google#8429

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)

`google_compute_health_check`

[modular-magician]

Hello! I am a robot who works on Magic Modules PRs.

I have detected that you are a community contributor, so your PR will be assigned to someone with a commit-bit on this repo for initial review.

Thanks for your contribution! A human will be with you soon.

@slevenick, please review this PR or find an appropriate assignee.

[upodroid]

I'm getting a weird error in the test.

The error is present in both TestAccComputeHealthCheckDatasource_basic and TestAccDataSourceComputeBackendService_basic

-----------------------------------------------------
2021/02/19 21:57:05 [DEBUG] Retry Transport: Stopping retries, last request was successful
2021/02/19 21:57:05 [DEBUG] Retry Transport: Returning after 1 attempts
    testing_new_config.go:96: no "id" found in attributes
    testing_new.go:49: no "id" found in attributes
--- FAIL: TestAccComputeHealthCheckDatasource_basic (29.44s)
FAIL
FAIL	github.com/hashicorp/terraform-provider-google-beta/v3/google-beta	31.702s
FAIL

2021/02/19 21:49:45 [DEBUG] Retry Transport: Stopping retries, last request was successful
2021/02/19 21:49:45 [DEBUG] Retry Transport: Returning after 1 attempts
    testing_new_config.go:96: no "id" found in attributes
    testing_new.go:49: no "id" found in attributes
--- FAIL: TestAccDataSourceComputeBackendService_basic (41.08s)

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 6 files changed, 121 insertions(+), 19 deletions(-))
Terraform Beta: Diff ( 6 files changed, 121 insertions(+), 19 deletions(-))

[slevenick]

I'm getting a weird error in the test.

The error is present in both TestAccComputeHealthCheckDatasource_basic and TestAccDataSourceComputeBackendService_basic

-----------------------------------------------------
2021/02/19 21:57:05 [DEBUG] Retry Transport: Stopping retries, last request was successful
2021/02/19 21:57:05 [DEBUG] Retry Transport: Returning after 1 attempts
    testing_new_config.go:96: no "id" found in attributes
    testing_new.go:49: no "id" found in attributes
--- FAIL: TestAccComputeHealthCheckDatasource_basic (29.44s)
FAIL
FAIL	github.com/hashicorp/terraform-provider-google-beta/v3/google-beta	31.702s
FAIL

2021/02/19 21:49:45 [DEBUG] Retry Transport: Stopping retries, last request was successful
2021/02/19 21:49:45 [DEBUG] Retry Transport: Returning after 1 attempts
    testing_new_config.go:96: no "id" found in attributes
    testing_new.go:49: no "id" found in attributes
--- FAIL: TestAccDataSourceComputeBackendService_basic (41.08s)

/gcbrun

Are you running the tests with a new version of Terraform core? I believe that 0.14.x causes some issues in datasource tests specifically, so we still run the CI tests on 0.13 or 0.12. I'd recommend having an alternate version of TF core to be able to run these sorts of tests

[slevenick]

/gcbrun

[upodroid]

Ah, Cameron mentioned something about this. I forgot

[upodroid]

Bump

[slevenick]

/gcbrun

Sorry I've taken so long to review!

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=177914"

[slevenick]

This seems good to me. Assuming tests pass I'll merge

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 6 files changed, 121 insertions(+), 19 deletions(-))
Terraform Beta: Diff ( 6 files changed, 121 insertions(+), 19 deletions(-))

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=177914"

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccComputeHealthCheckDatasource_basic|TestAccApiGatewayApiConfig_apigatewayApiConfigBasicExample|TestAccAccessContextManager|TestAccComposerEnvironment_withEncryptionConfig|TestAccNotebooksInstance_notebookInstanceFullExample You can view the result here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=177931"

[slevenick]

Test passes, thanks for the addition!