Allow workflow run control mutations to be called with API key auth (#22924)

## Context

A customer wants to control workflow runs from an external system /
their own automation calling the API. Today the workflow mutations are
gated by `UserAuthGuard`, which requires an interactive logged-in user
(`request.user`). API-key requests set `request.workspace` but never
`request.user`, so they can't call them.

## Change

`UserAuthGuard` was applied at the class level on
`WorkflowTriggerResolver`, blanketing all five mutations even though
only `runWorkflowVersion` actually consumes the user (it looks up the
workspace member to stamp `createdBy`).

This drops `UserAuthGuard` from the class and keeps it only on
`runWorkflowVersion`. As a result, these become callable with API-key
auth:
- `stopWorkflowRun`
- `retryWorkflowRun`
- `activateWorkflowVersion`
- `deactivateWorkflowVersion`

None of these ever referenced the user, so no logic depends on it.
`runWorkflowVersion` stays user-only because it needs a workspace member
to attribute `createdBy`.

Permissioning is unchanged: `SettingsPermissionGuard(WORKFLOWS)` stays
at the class level and already resolves the permission for API keys via
`apiKeyId`, so a key still needs the WORKFLOWS permission.

## Notes / open questions

- No actor is recorded for these operations today (they only change
run/version state), so exposing them to API keys doesn't drop any audit
that existed. Attributing API-key-initiated actions would be a
follow-up.
- If there's a deliberate product stance that workflow control should
stay user-only, this is a policy change worth confirming.

packages/twenty-server/src/engine/core-modules/workflow/resolvers/workflow-trigger.resolver.ts

@@ -33,7 +33,6 @@ import { WorkspaceMemberWorkspaceEntity } from 'src/modules/workspace-member/sta
 @CoreResolver()
 @UseGuards(
   WorkspaceAuthGuard,
-  UserAuthGuard,
   SettingsPermissionGuard(PermissionFlagType.WORKFLOWS),
 )
 @UsePipes(ResolverValidationPipe)
@@ -73,6 +72,7 @@ export class WorkflowTriggerResolver {
   }
 
   @Mutation(() => RunWorkflowVersionDTO)
+  @UseGuards(UserAuthGuard)
   async runWorkflowVersion(
     @AuthUser() user: AuthContextUser,
     @AuthWorkspace() workspace: WorkspaceEntity,