feat: Add expanded gcloud CLI feature repository by aqua (#708)

* Add ghcr.io/aqua/devcontainer-antigravity-cli

* fix ghcr.io/aqua/devcontainer-antigravity-cli contact/repo

* Add ghcr.io/aqua/devcontainer-gcloud.

This is a much-expanded version of siri404's gcloud feature, offering
options to install the various storage & pubsub emulators, appengine
components, etc.

The dependency closure of the various gcloud components is large and
the disk footprint for some of them is substantial, so all component
installs beyond the base CLI are off by default.

The "telemetry" feature of siri404's original feature has been removed.
While well-intentioned, it leaked ipgeo-mappable location information
and other potentially de-anonymizable details that should not be an
on-by-default disclosure.

* Fix ociReference formatting in collection-index.yml

---------

Co-authored-by: Devin Carraway <git@devin.com>
Co-authored-by: Abdurrahmaan Iqbal <abdurriq@github.com>

Author: 3 people

_data/collection-index.yml

@@ -1516,3 +1516,8 @@
   contact: https://github.com/cjcrobin/devcontainer-features/issues
   repository: https://github.com/cjcrobin/devcontainer-features
   ociReference: ghcr.io/cjcrobin/devcontainer-features
+- name: Google gcloud CLI feature by aqua
+  maintainer: aqua
+  contact: https://github.com/aqua/devcontainer-gcloud/issues
+  repository: https://github.com/aqua/devcontainer-gcloud
+  ociReference: ghcr.io/aqua/devcontainer-gcloud