Pass cuds through session storage to fix issue

[dwang3851]

Description

Passing cuds through session storage prevents the cookie that the cuds were previously passed through from overflowing.

Motivation and Context

Resolves issue #2274

How Has This Been Tested?

Tested locally by creating missing submissions for >400 students.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have run rubocop and erblint for style check. If you haven't, run overcommit --install && overcommit --sign to use pre-commit hook for linting
• [ ] My change requires a change to the documentation, which is located at Autolab Docs
• [ ] I have updated the documentation accordingly, included in this PR

Other issues / help required

If unsure, feel free to submit first and we'll help you along.

[coderabbitai[bot]]

📝 Walkthrough

Walkthrough

The changes rework how missing student IDs are handled during submission creation. The previous approach, which passed missing IDs as URL parameters, has been replaced with a session storage mechanism. A new JavaScript function in the missing submissions view collects the IDs and stores them, while the submission creation view now retrieves these stored IDs during the page load, adjusts the form elements accordingly, and updates the URL with the retrieved IDs.

Changes

File(s)	Change Summary
app/views/submissions/missing.html.erb	Added a new JavaScript function submitMissingIds that collects missing student IDs from the @missing array, stores them as a JSON string in session storage, and redirects the user to the submission creation page. The direct URL parameter usage has been removed, with a placeholder link ("#") now in place.
app/views/submissions/new.html.erb	Modified the check for course_user_datum_id from nil? to blank?. Introduced a JavaScript block that runs on DOMContentLoaded to retrieve stored IDs from session storage, update the input field for course_user_datum_id, toggle visibility of related form sections, and adjust the window location to include the retrieved IDs as a query parameter. A new div for stored IDs display was also added.

Sequence Diagram(s)

sequenceDiagram
    participant U as User
    participant M as Missing Submissions Page
    participant JS as JavaScript
    participant S as sessionStorage
    participant N as New Submission Page

    U->>M: Click "Fill In Empty Submissions"
    M->>JS: Trigger submitMissingIds()
    JS->>S: Store missing student IDs (JSON)
    JS->>M: Redirect to submission creation page
    U->>N: Load New Submission Page
    N->>JS: DOMContentLoaded event triggers
    JS->>S: Retrieve stored IDs
    JS-->>N: Update input field, toggle display, modify URL with IDs

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