fix(server): key connected-account lookup on handle and provider (#22964)

Connect flows (Google, Microsoft, IMAP/SMTP/CalDAV) looked up an
existing connectedAccount by `handle` alone, so connecting a second
account with the same handle but a different provider overwrote the
first instead of inserting a new row (e.g. IMAP inbox clobbering a
calendar-only Google account).

Fix: add the `provider` discriminator to the lookup. Same
provider+handle still updates; a different provider gets its own row.
Integration test covers the Google-then-IMAP case.

packages/twenty-server/src/engine/core-modules/auth/services/google-apis.service.ts

@@ -154,6 +154,7 @@ export class GoogleAPIsService {
             handle,
             userWorkspaceId,
             workspaceId,
+            provider: ConnectedAccountProvider.GOOGLE,
           },
         });
 

packages/twenty-server/src/engine/core-modules/auth/services/microsoft-apis.service.ts

@@ -120,6 +120,7 @@ export class MicrosoftAPIsService {
             handle,
             userWorkspaceId: userWorkspaceId,
             workspaceId,
+            provider: ConnectedAccountProvider.MICROSOFT,
           },
         });