Migration v15: No-op migration for schema consistency (#109604)

* migrate to v19

* migrate to v18

* Migration to be verified: v17 Convert minSpan to maxPerRow in panels

* Migration to be verified: 16 Grid layout migration

* Refactor v17 and v19 migrations to use shared helper functions

* Migration to be verified: 15 No-op migration for schema consistency

* Update v27.go

* Update v16.go

* cleanup

---------

Co-authored-by: Haris Rozajac <haris.rozajac12@gmail.com>
Co-authored-by: Haris Rozajac <58232930+harisrozajac@users.noreply.github.com>

apps/dashboard/pkg/migration/schemaversion/migrations.go

@@ -5,7 +5,7 @@ import (
 )
 
 const (
-	MIN_VERSION    = 15
+	MIN_VERSION    = 14
 	LATEST_VERSION = 41
 )
 
@@ -38,6 +38,7 @@ type PanelPluginInfoProvider interface {
 
 func GetMigrations(dsInfoProvider DataSourceInfoProvider, panelProvider PanelPluginInfoProvider) map[int]SchemaVersionMigrationFunc {
 	return map[int]SchemaVersionMigrationFunc{
+		15: V15,
 		16: V16,
 		17: V17,
 		18: V18,