docs: updates to use DML and other changes (#7834)

- Change existing data model guides and add new ones for DML
- Change module's docs around service factory + remove guides that are now necessary
- Hide/remove all mentions of module relationships, or label them as coming soon.
- Change all data model creation snippets to use DML
- use `property` instead of `field` when referring to a data model's properties.
- Fix all snippets in commerce module guides to use new method suffix (no more main model methods)
- Rework recipes, removing/hiding a lot of sections as a lot of recipes are incomplete with the current state of DML.


### Other changes

- Highlight fixes in some guides
- Remove feature flags guide
- Fix code block styles when there are no line numbers.

### Upcoming changes in other PRs

- Re-generate commerce module references (for the updates in the method names)
- Ensure that the data model references are generated correctly for models using DML.
- (probably at a very later point) revisit recipes

www/apps/resources/app/commerce-modules/promotion/examples/page.mdx

@@ -25,7 +25,7 @@ In this document, you’ll find common examples of how you can use the Promotion
     const promotionModuleService: IPromotionModuleService =
       request.scope.resolve(ModuleRegistrationName.PROMOTION)
 
-    const promotion = await promotionModuleService.create({
+    const promotion = await promotionModuleService.createPromotions({
       code: "10%OFF",
       type: "standard",
       application_method: {
@@ -55,7 +55,7 @@ In this document, you’ll find common examples of how you can use the Promotion
       await initializePromotionModule()
     const body = await request.json()
 
-    const promotion = await promotionModuleService.create({
+    const promotion = await promotionModuleService.createPromotions({
       code: "10%OFF",
       type: "standard",
       application_method: {
@@ -155,7 +155,7 @@ In this document, you’ll find common examples of how you can use the Promotion
     const promotionModuleService: IPromotionModuleService =
       request.scope.resolve(ModuleRegistrationName.PROMOTION)
 
-    const promotion = await promotionModuleService.create({
+    const promotion = await promotionModuleService.createPromotions({
       code: "10%OFF",
       type: "standard",
       application_method: {
@@ -191,7 +191,7 @@ In this document, you’ll find common examples of how you can use the Promotion
     const promotionModuleService =
       await initializePromotionModule()
 
-    const promotion = await promotionModuleService.create({
+    const promotion = await promotionModuleService.createPromotions({
       code: "10%OFF",
       type: "standard",
       application_method: {
@@ -236,7 +236,7 @@ In this document, you’ll find common examples of how you can use the Promotion
       request.scope.resolve(ModuleRegistrationName.PROMOTION)
 
     res.json({
-      promotions: await promotionModuleService.list(),
+      promotions: await promotionModuleService.listPromotions(),
     })
   }
   ```
@@ -256,7 +256,7 @@ In this document, you’ll find common examples of how you can use the Promotion
       await initializePromotionModule()
 
     return NextResponse.json({
-      promotions: await promotionModuleService.list(),
+      promotions: await promotionModuleService.listPromotions(),
     })
   }
   ```