Stream audit events to GCP logging for instance level UI
## Problem Statement
Create a separate form for Google Cloud Logging integration at instance level. This form should allow user to input the required Google Cloud Logging configuration data - Google project ID, client email, Log ID, and private key.
## Proposed Solution
Add a new form for google cloud logging integration. This form should use GraphQL APIs being implemented in https://gitlab.com/gitlab-org/gitlab/-/issues/415730+s.
### Design
The design is based on the updated design of [Update streaming audit event UI styles](https://gitlab.com/gitlab-org/gitlab/-/issues/411005)
Please see the description area for the overview and [Figma](https://www.figma.com/file/sLgk5YgIV2AazZt0zU8Ea3/Small-design-issues?type=design&node-id=157%3A18232&t=41JjReKNnmh0tGk1-1) for the specs
### Implementation plan
1. Remove the `v-if="!isInstance"` on all components that were created for group level
1. Update `ee/app/assets/javascripts/audit_events/components/audit_events_stream.vue` to pull in a list of google logging destinations using the [API](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/124038/diffs#439eac78a59a9e7e7f7e25d3d7301eb5ab927018_223_258)
1. Update `stream_google_cloud_logging_destination_editor.vue` mutation to switch between instance and group level
1. Update tests
1. Update ~documentation
issue