feat: allows specific regional location image to be created for GCP

[manoj-nutanix]

What problem does this PR solve?:

Which issue(s) does this PR fix?:

• https://jira.nutanix.com/browse/NCN-102718

Special notes for your reviewer:

konvoy-image-builder git:(NCN-102718) ✗ ./bin/konvoy-image-wrapper  build gcp --project-id ${GCP_PROJECT} --network ${NETWORK_NAME} images/gcp/ubuntu-2004.yaml --image-storage-locations us-west1
...
...
...
==> googlecompute.kib_image: Goss validate ran successfully
==> googlecompute.kib_image: 
==> googlecompute.kib_image: 
==> googlecompute.kib_image: 
==> googlecompute.kib_image: Downloading spec file and debug info
    googlecompute.kib_image: Downloading Goss specs from, /tmp/goss-spec.yaml and /tmp/debug-goss-spec.yaml to current dir
==> googlecompute.kib_image: Provisioning with shell script: /tmp/packer-shell1348402042
==> googlecompute.kib_image: Deleting instance...
    googlecompute.kib_image: Instance has been deleted!
==> googlecompute.kib_image: Creating image...
==> googlecompute.kib_image: Deleting disk...
    googlecompute.kib_image: Disk has been deleted!
==> googlecompute.kib_image: Running post-processor:  (type manifest)
Build 'googlecompute.kib_image' finished after 22 minutes 41 seconds.

==> Wait completed after 22 minutes 41 seconds

==> Builds finished. The artifacts of successful builds are:
--> googlecompute.kib_image: A disk image was created in the 'eng-ksphere-sandbox' project: konvoy-ubuntu-2004-1-29-6-20240924065827
--> googlecompute.kib_image: A disk image was created in the 'eng-ksphere-sandbox' project: konvoy-ubuntu-2004-1-29-6-20240924065827
➜  konvoy-image-builder git:(NCN-102718) ✗ 

Does this PR introduce a user-facing change?:

[supershal]

Fixed github actions to build GCP images with GCP network and specific GCP storage location