[messaging] remove v2 feature flag (#4845)

## Context
We are now removing Messaging V2 feature flag to use it everywhere.

## Implementation
- renaming FetchWorkspaceMessagesCommandsModule to
MessagingCommandModule to make it more generic since it it hosts all
commands related to the messaging module
- creating a crons folder inside commands and jobs crons should be named
with xxx.cron.command.ts instead of xxx.command.ts. Same for jobs, jobs
should be named with xxx.cron.job.ts. In a future PR we should make sure
those CronJobs implement a CronJob interface since it's a bit different
(a CronJob does not contain a payload compared to a Job)
- Cron commands have been renamed to "cron:$module:command" so
`fetch-all-workspaces-messages-from-cache:cron:start` has been renamed
to `cron:messaging:gmail-fetch-messages-from-cache`. Also having to
create a command to stop the cron is a bit painful to maintain so I
removed them for now, this can be easily done manually with pg-boss or
bull-mq
- Removing full-sync and partial-sync commands as they were there for
testing only, we might put them back at some point but we will have to
adapt the code anyway.
- Feature flag has been removed from the MessageChannel standard object
to make sure those new columns are created during the next sync-metadata

packages/twenty-server/src/modules/messaging/commands/messaging-command.module.ts

@@ -0,0 +1,17 @@
+import { Module } from '@nestjs/common';
+
+import { ObjectMetadataRepositoryModule } from 'src/engine/object-metadata-repository/object-metadata-repository.module';
+import { ConnectedAccountObjectMetadata } from 'src/modules/connected-account/standard-objects/connected-account.object-metadata';
+import { GmailFetchMessagesFromCacheCronCommand } from 'src/modules/messaging/commands/crons/gmail-fetch-messages-from-cache.cron.command';
+import { GmailPartialSyncCronCommand } from 'src/modules/messaging/commands/crons/gmail-partial-sync.cron.command';
+
+@Module({
+  imports: [
+    ObjectMetadataRepositoryModule.forFeature([ConnectedAccountObjectMetadata]),
+  ],
+  providers: [
+    GmailPartialSyncCronCommand,
+    GmailFetchMessagesFromCacheCronCommand,
+  ],
+})
+export class MessagingCommandModule {}