Inform new mentors about mentee application waiting period

[Madhawa97]

Is your feature request related to a problem? Please describe.
Implement a feature to inform new mentors they can wait for more mentee applications before approving a mentee, suggesting a 4-week waiting period.

Describe the solution you'd like

• Create informational message for new mentors

Tip: If you are a new mentor, wait for at least 4 weeks, before you finalize your mentees as you could receive more applications in the coming days.

• Display message prominently on mentor dashboard
• Add option to dismiss or acknowledge the message
• Add this information to the mentor guide

Describe alternatives you've considered

Additional context