[feature] Implement omnictl auth for omnictl + talosctl + kubectl in one command.

[usrbinkat]

Problem Description

Current omnictl/kubectl/talosctl authentication appears to be a passive UX, and each tool authenticates individually resulting in a UX friction and an inconsistent auth experience.

Additionally, per @rothgar 's observation we should also support multi cluster auth on a per Omni basis.

Solution

Enhance omnictl with a single oidc credential handler set of subcommand that correctly provision credentials in one go for all 3 tools with appropriate flags to constrain local credential provisioning more granularly when desired.

Also worth considering on this auth command flow is --force-rotate which should be able to clear current credentials and re-create files/directories for credentials from scratch on demand to resolve issue with "file not found" type errors that require manually tracking down and purging current auth artifacts in devcontainer settings.

Alternative Solutions

na

Notes

No response