File: components/script/dom/xrinputsourcearray.rs

PR Description

Issue: Fix GC borrow hazard in XRInputSourceArray::add_input_sources, remove_input_source, and add_remove_input_source.

Changes:

1. Removed long-lived mutable borrows of input_sources.
2. Replaced with short-lived mutable borrows as needed.
3. Updated debug_assert! to avoid referencing removed variable.

Impact:
Resolves potential panic during garbage collection by ensuring short-lived borrows, reducing GC-related risks.

• ./mach build -d does not report any errors
• ./mach test-tidy does not report any errors
• These changes fix GC borrow hazard in XRInputSourceArray::add_input_sources #33856

• There are tests for these changes OR
• These changes do not require tests because they only refactor code to fix borrow hazards without altering functionality.