[Filestore] Enable regional endpoint (REP) support

[astra1503]

Description

Enables Regional Endpoint (REP) support for Filestore resources (google_filestore_instance, google_filestore_backup, google_filestore_snapshot).

Changes Made

1. Updated mmv1/products/filestore/product.yaml to include rep_url for both GA (v1) and Beta (v1beta1) endpoints.
2. Updated mmv1/templates/terraform/constants/filestore_instance.go.tmpl to extract location and pass it to FilestoreOperationWaitTime.

Testing

• Generated GA and Beta provider code via make provider PRODUCT=filestore.
• Verified local compilation and tests passing via go test ./google/services/filestore.

filestore: added regional endpoint (REP) support for `google_filestore_instance`, `google_filestore_backup`, and `google_filestore_snapshot`

[github-actions]

Googlers: For automatic test runs see go/terraform-auto-test-runs.

@SirGitsalot, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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[astra1503]

/gcbrun

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 67dbfa1:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	11 files changed, 99 insertions(+), 15 deletions(-)
google-beta provider	View Diff	11 files changed, 99 insertions(+), 15 deletions(-)
terraform-google-conversion	View Diff	1 file changed, 2 insertions(+)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
21	21	0	0

Affected Service Packages

• filestore

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