Promote logConfig of Healthchecks to GA

[upodroid]

Forgot to apply #3861 to Regional Healthchecks too. That bug is causing diffs with HCs created for HTTPS ILBs

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)

compute: promoted `log_config` field of `google_compute_health_check` and `google_compute_region_health_check`

compute: set the default value for log_config.enable on `google_compute_region_health_check` to avoid permanent diff on plan/apply. 

[modular-magician]

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

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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 ( 4 files changed, 143 insertions(+), 2 deletions(-))
Terraform Beta: Diff ( 3 files changed, 3 insertions(+), 2 deletions(-))
Ansible: Diff ( 4 files changed, 110 insertions(+))
TF Conversion: Diff ( 2 files changed, 58 insertions(+))
Inspec: Diff ( 2 files changed, 2 insertions(+), 2 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=189639"

[slevenick]

Why would we change this when GAing the fields?

It feels dangerous to change default values for no reason, can we remove this?

[upodroid]

I'm applying the fix from #3861

[upodroid]

For me, the fix is more important the promotion

[slevenick]

Ah, ok it's a region/zone thing that got missed previously. Makes sense