Fix: Persist data from Personal Info in Available Sessions Page

[NathanSouphanthong]

Notion ticket link

Registration: Existing registration details don’t persist if a parent returns from session selection

Implementation description

• Move the useState initialization of the RegistrantExperienceCamper array to the RegistrantExperience page instead of inside the RegistrationSteps page
• Pass the state and setter into the RegistrationSteps component

Steps to test

1. Navigate to the registration page for a camp
2. Fill out all the info for Step 1 - Personal Info
3. Click the next button
4. Go back twice to the Available Session page
5. The Personal Info data that was filled out should persist

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

[github-actions]

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[williamtran10]

LGTM. Should we add these changes to the waitlist registration too?

[NathanSouphanthong]

LGTM. Should we add these changes to the waitlist registration too?

Good catch. Just added the changes to the Waitlist Registration 👍