region NEG moved to TPG

[venkykuberan]

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).
• [ X] 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).
• [X ] 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 `google_compute_region_network_endpoint_group` to GA

fixes hashicorp/terraform-provider-google#7479

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 5 files changed, 1089 insertions(+), 14 deletions(-))
Terraform Beta: Diff ( 2 files changed, 21 insertions(+), 25 deletions(-))
TF Conversion: Diff ( 1 file changed, 238 insertions(+))
TF OiCS: Diff ( 3 files changed, 10 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=153627"

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDataSourceSpannerInstance_basic You can view the result here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=153645"

[danawillow]

Looks good! I updated the release note a bit for clarity (since it's not moving out of the beta provider, it's just also in GA now) and updated the PR description so that it closes the issue on merge. Take a look at the changes I made :)