Fix validation for edit meal request modal

[ColinToft]

Notion Ticket Link

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Implementation Description

• Adds validation (and red highlights if errors) on the edit meal request modal

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 added tests for my changes
• 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]

Visit the preview URL for this PR (updated for commit a316bb6):

https://feeding-canadian-kids-staging--pr163-edit-meal-request-0iez1o2n.web.app

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[shahanneda]

Looks good! So we pretty much decided both delivery instructions and dietary restrictions is not required? (followed up in slack)