Refs #26473 - refactored code & removed unwanted code in gce.rb

This commit includes
- modified help text of certificate_path on GCE compute_resource form
- show volume information for host correctly

Fixes #26526 - renamed state column to status for vms in GCE

Fixes #26496 - Added user-data support for GCE

Fixes #22749 - fix user & sshkey creation for VM in GCE

With this commit, able to create user using username from image
and sshkey for this user now gets stored inside VM.

Refs #26473 - validation error on multiple disks in GCE

Disk object is returning hash with symbol keys so renaming key
from 'DeviceName ' to ':device_name'

Fixes #4179 - handled ephemeral public IP

With this commit, it will allow user to create
ephemeral public IP as external_ip field removed from APIs

Refs #26473 - argumentError on instance.insert

Fixes #26473 - GCE changes as per fog-google changes

Refs #26080 - dropped fixes from input value types

Fixes #19768 - Fix Layout/ClosingParenthesisIndentation cop