storage: add SetResourceIdentityAttributes in update

[BBBmau]

Fixes hashicorp/terraform-provider-google#27595
Fixes hashicorp/terraform-provider-google#27596

This slipped through due to the missing identity error only existing in older versions of terraform.

In an attempt to reproduce i got no error on terraform version 1.14.0

however when downgrading to 1.5.7 i get the following:

󰀵 mau  …/󰲋 /Scratch/storage_bucket_identity_bug   12:30   envchain GCLOUD terraform apply
google_storage_bucket.bucket: Refreshing state... [id=storage-identity-bucket]

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  ~ update in-place

Terraform will perform the following actions:

  # google_storage_bucket.bucket will be updated in-place
  ~ resource "google_storage_bucket" "bucket" {
      ~ force_destroy               = true -> false
        id                          = "storage-identity-bucket"
        name                        = "storage-identity-bucket"
        # (17 unchanged attributes hidden)

        # (2 unchanged blocks hidden)
    }

Plan: 0 to add, 1 to change, 0 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

google_storage_bucket.bucket: Modifying... [id=storage-identity-bucket]
╷
│ Error: Missing Resource Identity After Update: The Terraform provider unexpectedly returned no resource identity after having no errors in the resource update. This is always a problem with the provider and should be reported to the provider developer
│ 
│   with google_storage_bucket.bucket,
│   on main.tf line 1, in resource "google_storage_bucket" "bucket":
│    1: resource "google_storage_bucket" "bucket" {
│ 
╵

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

storage: fixed missing identity error when updating values in `google_storage_bucket`

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 7a2f23d:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	1 file changed, 4 insertions(+), 1 deletion(-)
google-beta provider	View Diff	1 file changed, 4 insertions(+), 1 deletion(-)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
135	124	11	0

Affected Service Packages

• storage

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[zli82016]

Need to wait for tests run complete before merging the PR.