Disable master maintenance scripts when admin server runs (#8499)

* Disable master maintenance scripts when admin server runs

* Stop defaulting master maintenance scripts

* Apply suggestion from @gemini-code-assist[bot]

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Apply suggestion from @gemini-code-assist[bot]

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Clarify master scripts are disabled by default

* Skip master maintenance scripts when admin server is connected

* Restore default master maintenance scripts

* Document admin server skip for master maintenance scripts

---------

Co-authored-by: Copilot <copilot@github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

weed/admin/dash/admin_lock_manager.go

@@ -4,12 +4,13 @@ import (
 	"sync"
 	"time"
 
+	"github.com/seaweedfs/seaweedfs/weed/cluster"
 	"github.com/seaweedfs/seaweedfs/weed/wdclient"
 	"github.com/seaweedfs/seaweedfs/weed/wdclient/exclusive_locks"
 )
 
 const (
-	adminLockName       = "shell"
+	adminLockName       = cluster.AdminShellLockName
 	adminLockClientName = "admin-plugin"
 )