Remove dead code linked to quick actions

[FelixMalfait]

Removing dead code, we'll take another approach to build this

[greptile-apps]

PR Summary

The pull request removes dead code related to quick actions, including hooks, tests, and associated GraphQL mutations, to streamline the codebase.

• Removed Hooks and Tests: Deleted useExecuteQuickActionOnOneRecord.ts, useExecuteQuickActionOnOneRecordMutation.ts, and their associated test files from packages/twenty-front/src/modules/object-record/hooks.
• Updated useRecordActionBar.tsx: Removed references to quick actions, including the handleExecuteQuickActionOnClick function and the useExecuteQuickActionOnOneRecord hook.
• Removed Server-Side Quick Actions: Deleted execute-quick-action-on-one-resolver.factory.ts, quick-actions.module.ts, and quick-actions.service.ts from packages/twenty-server/src/engine/api/graphql/workspace-resolver-builder.
• Feature Flag Removal: Removed IS_QUICK_ACTIONS_ENABLED from packages/twenty-front/src/modules/workspace/types/FeatureFlagKey.ts.
• Environment Variable Cleanup: Removed OPENROUTER_API_KEY from packages/twenty-server/src/engine/integrations/environment/environment-variables.ts.

_{21 file(s) reviewed, no comment(s)
Edit PR Review Bot Settings}