Allow deleting google_logging_*_bucket_config

[ichbinfrog]

Allows deleting log bucket configuration (fixes hashicorp/terraform-provider-google#11412 since I have the same use case as tracked by that issue).

The upstream API already returns a 403: Bucket _Default cannot be deleted (for undeletable buckets) but I opted not to use it because deleting _Default or _Required would always fail then.

I'm not sure whether or not there are e2e tests involved in resource deletion so I had to test them semi-manually (override provider to local built and then creating and destroying resources).

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)

logging: made `google_logging_*_bucket_config` deletable

[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.

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

[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, 19 insertions(+), 3 deletions(-))
Terraform Beta: Diff ( 1 file changed, 19 insertions(+), 3 deletions(-))
TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 1986
Passed tests 1743
Skipped tests: 240
Failed tests: 3

Action taken

Triggering VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccLoggingBucketConfig_CreateBuckets_withCustomId|TestAccFirebaserulesRelease_BasicRelease|TestAccDatasourceGoogleServiceNetworkingPeeredDnsDomain_basic

[modular-magician]

Tests passed during RECORDING mode:
TestAccDatasourceGoogleServiceNetworkingPeeredDnsDomain_basic[view]
TestAccLoggingBucketConfig_CreateBuckets_withCustomId[view]
TestAccFirebaserulesRelease_BasicRelease[view]

All tests passed
View the build log or the debug log for each test

[ScottSuarez]

Could you update your release note to follow the Release Notes Guide

[ichbinfrog]

My bad, I've updated the release note on the PR

[ScottSuarez]

thanks !