Add is unique in migration v2 + refactor inferDeletionFromMissingEntities (#15070)

## Goal
- inferDeletionFromMissingEntities is now a map instead of a single
bool, allowing us to parameterise it based on the entity we want to
compare
- Adding index creation/update when field isUnique is set to true and
index deletion when isUnique is false (for now)

close https://github.com/twentyhq/core-team-issues/issues/1346

packages/twenty-server/src/engine/metadata-modules/database-event-trigger/services/database-event-trigger-v2.service.ts

@@ -75,7 +75,6 @@ export class DatabaseEventTriggerV2Service {
           },
           buildOptions: {
             isSystemBuild: false,
-            inferDeletionFromMissingEntities: false,
           },
         },
       );
@@ -156,7 +155,6 @@ export class DatabaseEventTriggerV2Service {
           },
           buildOptions: {
             isSystemBuild: false,
-            inferDeletionFromMissingEntities: false,
           },
         },
       );
@@ -242,7 +240,9 @@ export class DatabaseEventTriggerV2Service {
           },
           buildOptions: {
             isSystemBuild: false,
-            inferDeletionFromMissingEntities: true,
+            inferDeletionFromMissingEntities: {
+              databaseEventTrigger: true,
+            },
           },
           workspaceId,
         },