CB fixes

* Missing Level -> LevelStem generic in StructureCheck
  Need to use the right for injectDatafixingContext (Spottedleaf)

* Fix summon_entity effect attempting to add incorrect entity (granny)

* Removed incorrect parent perm for `minecraft.debugstick.always` (Machine_Maker)

* Fixed method signature of Marker#addPassenger (Machine_Maker)

* Removed unneeded UOE in CustomWorldChunkManager (extends BiomeSource) (Machine_Maker)

* Honor Server#getLootTable method contract (Machine_Maker)

Co-authored-by: Spottedleaf <Spottedleaf@users.noreply.github.com>

paper-server/patches/sources/net/minecraft/world/level/levelgen/structure/StructureCheck.java.patch

@@ -0,0 +1,20 @@
+--- a/net/minecraft/world/level/levelgen/structure/StructureCheck.java
++++ b/net/minecraft/world/level/levelgen/structure/StructureCheck.java
+@@ -40,7 +40,7 @@
+     private final ChunkScanAccess storageAccess;
+     private final RegistryAccess registryAccess;
+     private final StructureTemplateManager structureTemplateManager;
+-    private final ResourceKey<Level> dimension;
++    private final ResourceKey<net.minecraft.world.level.dimension.LevelStem> dimension; // Paper - fix missing CB diff
+     private final ChunkGenerator chunkGenerator;
+     private final RandomState randomState;
+     private final LevelHeightAccessor heightAccessor;
+@@ -54,7 +54,7 @@
+         ChunkScanAccess chunkIoWorker,
+         RegistryAccess registryManager,
+         StructureTemplateManager structureTemplateManager,
+-        ResourceKey<Level> worldKey,
++        ResourceKey<net.minecraft.world.level.dimension.LevelStem> worldKey, // Paper - fix missing CB diff
+         ChunkGenerator chunkGenerator,
+         RandomState noiseConfig,
+         LevelHeightAccessor world,