feat(cli): unify resource deletion

[justusschock]

What

• adds one shared delete-command registration utility with positional resource identifiers
• standardizes Studio, Job, MMT, Deployment, Container, API key, Sandbox, and Snapshot deletion
• prompts with the Click default-no [y/N] confirmation, supports -y/--yes, and prints <Resource> deleted
• registers each command directly with its CLI group, using small resolver callbacks only for nonuniform APIs
• keeps deletion output human-readable only; delete commands do not expose --json

Commands and output

Enter accepts the safe default and aborts deletion; enter y to confirm.

Studio

$ lightning studio delete my-studio
Are you sure you want to delete? [y/N]: y
Studio deleted

$ lightning studio delete my-studio -y
Studio deleted

Job

$ lightning job delete my-job
Are you sure you want to delete? [y/N]: y
Job deleted

$ lightning job delete my-job -y
Job deleted

Multi-machine job

$ lightning mmt delete my-mmt
Are you sure you want to delete? [y/N]: y
Multi-machine job deleted

$ lightning mmt delete my-mmt -y
Multi-machine job deleted

Deployment

$ lightning deployment delete my-deployment
Are you sure you want to delete? [y/N]: y
Deployment deleted

$ lightning deployment delete my-deployment -y
Deployment deleted

Container

$ lightning container delete my-container
Are you sure you want to delete? [y/N]: y
Container deleted

$ lightning container delete my-container -y
Container deleted

API key

$ lightning api-key delete key-123
Are you sure you want to delete? [y/N]: y
API key deleted

$ lightning api-key delete key-123 -y
API key deleted

Sandbox

$ lightning sandbox delete sbx-42
Are you sure you want to delete? [y/N]: y
Sandbox deleted

$ lightning sandbox delete sbx-42 -y
Sandbox deleted

Sandbox snapshot

$ lightning sandbox snapshot delete snap-9
Are you sure you want to delete? [y/N]: y
Snapshot deleted

$ lightning sandbox snapshot delete snap-9 -y
Snapshot deleted

Context overrides remain available where applicable: --teamspace for Studio, Job, MMT, Deployment, and Container; --org for API keys; and --api-key for Sandboxes and Snapshots.

Why

Deletion commands had separate implementations and inconsistent arguments, confirmation behavior, flags, and success output. This gives every registered resource deletion command the same user-facing contract.

[tejapulagam]

Job / MMT / container / API key : currently delete automatically with no prompt; now this will prompt unless -y is included in the command so this might cause hangs in existing user scripts?

[justusschock]

Job / MMT / container / API key : currently delete automatically with no prompt; now this will prompt unless -y is included

that's true, but at some point we need to make a breaking change if we want to unify this.
We don't auto-upgrade the SDK and usually users should have it pinned as well.

[ethanwharris]

Code looks good, slight preference for y/N but nbd