feat: allow updating and deleting nexus endpoint via id

[chene40]

What was changed

• add support for cloud nexus endpoint updates and delete via in (in addition to endpoint name)

Why?

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

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Note

Low Risk
CLI-only change reusing existing Cloud API lookups; no new server behavior beyond optional ID-based resolution.

Overview
temporal cloud nexus endpoint delete and update can target an endpoint with --id as well as --name. Exactly one of those flags is required; using both or neither returns a validation error. Help text and commands.yml were updated to match.

Lookup for get, delete, and update now goes through shared resolveNexusEndpoint, which calls GetNexusEndpoint when an ID is set and the existing name-based list filter otherwise.

Tests cover delete/update by ID and the name/id validation cases.

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