Added signout button to intake forms

[UmairHundekar]

Notion ticket link

Ticket Name

Implementation description

• Signout added to intake form header for participants and volunteers

Steps to test

1. Go to all volunteer and participant forms and check if the signout button is there and sends to login screen

What should reviewers focus on?

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR