feat!: promote gce_pd_csi_driver to GA

[mnahkies]

Promotes the gce_pd_csi_driver variable to GA, as it has been GA in GKE since:

• (Linux) https://cloud.google.com/kubernetes-engine/docs/release-notes#January_11_2021
• (Windows) https://cloud.google.com/kubernetes-engine/docs/release-notes#March_16_2022

Notes

• ⚠️ Enables by default to match the behavior of create cluster when it is omitted
  • I think this is safe and desirable, but let me know if not. People can override it when upgrading the module if they wish to leave it disabled on older clusters.
• ✔️ versions.tf.tmp doesn't need updating, as the underlying config was made GA in an earlier version than already specified

Questions

• Should I update the changelog?

[bharathkkb]

Thanks for the PR @mnahkies
Agreed regarding default and can we add a small upgrade guide to call this out showing how users can set this to false similar to https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/blob/master/docs/upgrading_to_v24.0.md#master_global_access_enabled-in-ga-private-cluster-module

[mnahkies]

Thanks for the PR @mnahkies Agreed regarding default and can we add a small upgrade guide to call this out showing how users can set this to false similar to https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/blob/master/docs/upgrading_to_v24.0.md#master_global_access_enabled-in-ga-private-cluster-module

Thanks for the review @bharathkkb - I've synced in changes from master and added an upgrade guide.

I took the liberty of including a note about #1495 as I noticed there was no guide for it's changes that are scheduled for release in #1512 - though please let me know if that should be added elsewhere / omitted.

[comment-bot-dev]

@mnahkies
Thanks for the PR! 🚀
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[bharathkkb]

Thanks @mnahkies!