Add Page Size Selector to Requests view

[cycomachead]

General Info

• Pivotal Tracker Story
• Breaking?

Changes

Updates the pending requests (instructor index) table to improve usability for larger datasets:

• Sets the default page length to 50 rows (previously defaulted to DataTables' built-in 10)
• Adds a page size selector with options: 25, 50, 100, 200, All
• Re-adds the pageLength feature to the topStart layout cell so the selector renders alongside the existing Columns/Batch Edit buttons

All changes are client-side only in requests_controller.js — no Ruby or database changes needed.

Note for reviewers: The page-size dropdown and the Columns/Batch Edit buttons now share the top-left cell. Worth a quick visual check that the layout looks clean, though DataTables-bs5 handles this automatically.

Testing

Manually verify on the pending requests view that:

1. The table defaults to 50 rows per page on load
2. The page-size dropdown appears and offers 25, 50, 100, 200, and All options
3. Selecting a different page size updates the table correctly
4. The existing Columns and Batch Edit buttons still render and function correctly alongside the new dropdown

Documentation

No documentation changes required.

Checklist

• Name of branch corresponds to story

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