Fix new project team activities not showing up in activity page

What does this MR do and why?

Fix new project team activities not showing up in activity page

Query Plans

• Before: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/43284/commands/132244
• After: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/43284/commands/132246

References

Related to #569389 (closed)

Screenshots or screen recordings

Before	After
Screen_Recording_2025-09-10_at_6.14.08_PM	Screen_Recording_2025-09-10_at_6.11.09_PM

How to set up and validate locally

1. Go to Project > Manage > Members > Invite Members and invite a new user.
2. Go to Project > Manage > Activity > Team and see that a new activity has been logged.

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.