Add volume and image encryption feature (backport #1151)

[mergify]

Summary

• Add Encrypted, Decrypted radio buttons and source image dropdown In image create page,
• In storage class create page, add volume encryption radio button and secret namespace, secret name select dropdowns
• Show lock icon if image / volume is encrypted.
• Hide "export image" action if volume is encrypted
• Show encryption and secret in image detail page.

PR Checklist

• Is this a multi-tenancy feature/bug?
  • Yes, the relevant RBAC changes are at:
• Do we need to backport changes to the old Rancher UI, such as RKE1?
  • Yes, the relevant PR is at:
• Are backend engineers aware of UI changes?
  • Yes, the backend owner is: @Yu-Jack

Related Issue #
harvester/harvester#6493

Screenshot/Video

Create Storage class with Secret
create_sc.webm

Encrypted & decrypt Image
image_en:decrypt.webm

Encrypt volume
volume_encypt.webm

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This is an automatic backport of pull request #1151 done by [Mergify](https://mergify.com).