Always start token rotation (#39533)

- @noahtalerman: For the following quick win:
  - https://github.com/fleetdm/fleet/issues/44681

---

Remove the fleet-desktop conditional so the token/device identifier
rotation is started unconditionally. This keeps the device identifier
(e.g. /opt/orbit/identifier) up to date for refetch-host, device auth,
and Fleet Desktop, and defers stopping the rotation as before.

<!-- Add the related story/sub-task/bug number, like Resolves #123, or
remove if NA -->
**Related issue:** Resolves #31421

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

- [ ] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.

- [ ] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)
- [ ] If paths of existing endpoints are modified without backwards
compatibility, checked the frontend/CLI for any necessary changes

## Testing

- [ ] Added/updated automated tests
- [ ] Where appropriate, [automated tests simulate multiple hosts and
test for host
isolation](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/reference/patterns-backend.md#unit-testing)
(updates to one hosts's records do not affect another)

- [ ] QA'd all new/changed functionality manually

For unreleased bug fixes in a release candidate, one of:

- [ ] Confirmed that the fix is not expected to adversely impact load
test results
- [ ] Alerted the release DRI if additional load testing is needed

## Database migrations

- [ ] Checked schema for all modified table for columns that will
auto-update timestamps during migration.
- [ ] Confirmed that updating the timestamps is acceptable, and will not
cause unwanted side effects.
- [ ] Ensured the correct collation is explicitly set for character
columns (`COLLATE utf8mb4_unicode_ci`).

## New Fleet configuration settings

- [ ] Setting(s) is/are explicitly excluded from GitOps

If you didn't check the box above, follow this checklist for
GitOps-enabled settings:

- [ ] Verified that the setting is exported via `fleetctl
generate-gitops`
- [ ] Verified the setting is documented in a separate PR to [the GitOps
documentation](https://github.com/fleetdm/fleet/blob/main/docs/Configuration/yaml-files.md#L485)
- [ ] Verified that the setting is cleared on the server if it is not
supplied in a YAML file (or that it is documented as being optional)
- [ ] Verified that any relevant UI is disabled when GitOps mode is
enabled

## fleetd/orbit/Fleet Desktop

- [ ] Verified compatibility with the latest released version of Fleet
(see [Must
rule](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/workflows/fleetd-development-and-release-strategy.md))
- [ ] If the change applies to only one platform, confirmed that
`runtime.GOOS` is used as needed to isolate changes
- [ ] Verified that fleetd runs on macOS, Linux and Windows
- [ ] Verified auto-update works from the released version of component
to the new version (see [tools/tuf/test](../tools/tuf/test/README.md))


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

## Release Notes

* **Bug Fixes**
* Device token rotation is now enabled for all runs, ensuring consistent
behavior across all scenarios.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Noah Talerman <47070608+noahtalerman@users.noreply.github.com>

orbit/cmd/orbit/orbit.go

@@ -1221,13 +1221,11 @@ func orbitAction(c *cli.Context) error {
 		}
 	}
 
-	if c.Bool("fleet-desktop") {
-		// Ensure that the token rotation checker is started,
-		// so that we have a valid token to launch the
-		// My Device page.
-		stopRotation := trw.StartRotation()
-		defer stopRotation()
-	}
+	// Always keep the device identifier (e.g. /opt/orbit/identifier) up to date
+	// with periodic rotation, so it's valid for refetch-host, device auth, and
+	// Fleet Desktop when enabled.
+	stopRotation := trw.StartRotation()
+	defer stopRotation()
 
 	switch runtime.GOOS {
 	case "darwin":