Rename parsoid stash backend config var.

This changes the name of a key in the ParsoidCacheConfig array:
StashType is more in line with other configuration variables that refer
to on aobject cache type.

This is not a breaking change since ParsoidCacheConfig was only
introduced recently and is not in used in WMF config nor present in any
release.

This is a Follow-up to Ic67dc43ed9843810e4b180127f9a3bb7608f7608.

Change-Id: I9e61a6f94ec8bf1716c7d735f9bb17af4461fc9c

docs/config-schema.yaml

@@ -2383,13 +2383,13 @@ config-schema:
     ParsoidCacheConfig:
         type: object
         default:
-            StashBackend: null
+            StashType: null
             StashDuration: 86400
             CacheThresholdTime: 0.0
         description: |-
             Configuration for the caching related to parsoid output. The configuration contains the
             following keys:
-            - StashBackend: The name of the object store to be used by the ParsoidOutputStash service,
+            - StashType: The type of object store to be used by the ParsoidOutputStash service,
                   which stores the base state of HTML based edits.
                   Valid options are the keys of {@link $wgObjectCaches}, e.g. CACHE_* constants.
                   Per default, the value of the MainStash setting will be used.

includes/MainConfigSchema.php

@@ -3737,7 +3737,7 @@ class MainConfigSchema {
 	 * Configuration for the caching related to parsoid output. The configuration contains the
 	 * following keys:
 	 *
-	 * - StashBackend: The name of the object store to be used by the ParsoidOutputStash service,
+	 * - StashType: The type of object store to be used by the ParsoidOutputStash service,
 	 *       which stores the base state of HTML based edits.
 	 *       Valid options are the keys of {@link $wgObjectCaches}, e.g. CACHE_* constants.
 	 *       Per default, the value of the MainStash setting will be used.
@@ -3761,7 +3761,7 @@ class MainConfigSchema {
 	public const ParsoidCacheConfig = [
 		'type' => 'object',
 		'default' => [
-			'StashBackend' => null,
+			'StashType' => null,
 			'StashDuration' => 24 * 60 * 60,
 			'CacheThresholdTime' => 0.0
 		]

includes/ServiceWiring.php

@@ -1327,8 +1327,8 @@ return [
 		// TODO: Determine storage requirements and config options for stashing parsoid
 		//       output for VE edits (T309016).
 		$config = $services->getMainConfig()->get( MainConfigNames::ParsoidCacheConfig );
-		$backend = $config['StashBackend']
-			? ObjectCache::getInstance( $config['StashBackend'] )
+		$backend = $config['StashType']
+			? ObjectCache::getInstance( $config['StashType'] )
 			: $services->getMainObjectStash();
 
 		return new SimpleParsoidOutputStash( $backend, $config['StashDuration'] );

includes/config-schema.php

@@ -504,7 +504,7 @@ return [
 			'EnableWANCacheReaper' => false,
 			'MainStash' => 'db-replicated',
 			'ParsoidCacheConfig' => [
-				'StashBackend' => null,
+				'StashType' => null,
 				'StashDuration' => 86400,
 				'CacheThresholdTime' => 0.0,
 			],