Add persistence info to start-dev banner

[SAY-5]

What was changed

temporal server start-dev now prints a Persistence: line at the end of the startup banner.

In-memory (no --db-filename):

Persistence:      in-memory (Workflow Executions are lost when the server process exits)

File-backed:

Persistence:      file (/path/to/dev.sqlite)

Why?

Per #634, the start-dev banner did not surface what form of persistence the dev server uses, so users could not tell at a glance whether Workflow Executions would survive a restart.

Checklist

1. Closes [Feature Request] Add persistence information to start-dev banner #634

2. How was this tested:

Two new tests in internal/temporalcli/commands.server_test.go start the dev server, capture stdout, and assert that the banner contains Persistence: plus the expected backend description. Both pass locally and fail when the banner change is reverted.

$ go test -run TestServer_StartDev_BannerPersistence ./internal/temporalcli/
ok  	github.com/temporalio/cli/internal/temporalcli	10.318s

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[chaptersix]

A few suggestions on the banner format:

1. Label prefix: The other banner entries all use a Temporal prefix (Temporal Server:, Temporal UI:, etc.) — Persistence: should follow suit and become Temporal Persistence:.

2. Placement: Move the persistence line between Temporal Server: and Temporal UI: so it's grouped with server-level info rather than appended at the end.

3. Drop the warning text: The in-memory description (Workflow Executions are lost when the server process exits) is likely to alarm users unnecessarily. Just in-memory is enough — users can look up what that means, and it's already well-understood.

4. Column width: With Temporal Persistence: being 21 chars, bump the format width from %-17s to %-21s across all lines to keep alignment.

Suggested output:

Temporal CLI 0.0.0-DEV (Server 1.31.0, UI 2.49.1)

Temporal Server:      localhost:7233
Temporal Persistence: in-memory
Temporal UI:          http://localhost:8233
Temporal Metrics:     http://localhost:61114/metrics

And for file-backed:

Temporal Persistence: /path/to/dev.sqlite

[chaptersix]

Please make sure you have signed the Temporal CLA before this can be merged.

[SAY-5]

Applied all four banner suggestions in 2b09ade: Temporal Persistence: label, moved between Server and UI, dropped the in-memory warning text, and bumped width to %-21s across all lines. Updated the test assertions to match. CLA still pending on my side.