fix: correct misleading xdc-redirection note in workflow delete warning

[jiechenz]

What was changed

Trims the temporal workflow delete warning (added in #1029) — both the runtime message and the command help text — to:

WARNING: In a global Namespace, deleting a Workflow Execution removes it from all clusters and cannot be undone.

The previous wording was removed:

Requests sent to a passive cluster are forwarded to the active cluster by default; to target the passive cluster directly, specify --grpc-meta xdc-redirection=false.

Why?

The removed sentence was misleading in the one command where it was placed:

• workflow delete calls the frontend DeleteWorkflowExecution, a mutating op. For a global Namespace it must be served by the active cluster.

• Setting --grpc-meta xdc-redirection=false disables forwarding, so a passive cluster has nowhere to send the request and rejects it:

  failed starting batch operation: Namespace: global-ns is active in cluster: cluster-a,
  while current cluster cluster-b is a standby cluster.
  

So the flag can't produce a "passive-only" delete — it only converts a forwarded success into a local failure. The forwarding/redirection behavior is also generic XDC semantics, not delete-specific, so it doesn't belong pinned to this single command's help. That concept is better documented on docs.temporal.io.

The kept sentence captures the genuinely delete-specific, accurate point: the blast radius (all clusters) and irreversibility.

Checklist

1. Closes

2. How was this tested:

make gen regenerated commands.gen.go (no more xdc-redirection references) and:

go test ./internal/temporalcli/ -run 'TestSharedServerSuite/TestWorkflow_Delete' -count=1
ok  github.com/temporalio/cli/internal/temporalcli

Existing delete tests updated to assert against the new warning substring.

3. Any docs updates needed?

The active/standby request-forwarding (xdc-redirection) behavior would be better explained in the multi-cluster section of docs.temporal.io rather than in CLI help.

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