feat(provider/google): Added new disks type for gce in clouddriver

[jangjaelee]

Added new disks type for gce in clouddriver.
currently, only can be used pd-standard and pd-ssd.

reference link : https://cloud.google.com/compute/docs/disks

[jangjaelee]

Detail in issue link: spinnaker/spinnaker#6814

[JangGyeongSik]

I agree with the issues above.

It would be nice to add Balanced Diks and Extreme Disks to GCE.

[jasonmcintosh]

My only question given this is an enum:

• Are there any tests anyplace that show this in use? Sadly doesn't SEEM like there are great tests around this atm.
• Are there any UI/other changes downstream to support this (not looked at Deck for any of this?)
  But overall, simple and being an enum list of supported options, at least somewhat straightforward. There ARE places I've already seen like:
  https://github.com/spinnaker/clouddriver/blob/master/clouddriver-google/src/main/groovy/com/netflix/spinnaker/clouddriver/google/deploy/validators/StandardGceAttributeValidator.groovy#L413 but I don't THINK that needs to be adjusted.

[jasonmcintosh]

https://github.com/search?q=org%3Aspinnaker%20pd-ssd&type=code

FYI quite a few other places look like they'd need to be changed to support this. We can merge this, but more will be required.

[mattgogerly]

@Mergifyio update

[mergify]

update

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