Problems:
- The class uses a bare Map field, but some methods can trigger GC
causing it to have a potential dangling pointer in case of map
compaction.
- Some methods invalidate the object state and should not be used again.
- Complicate logic with a no_gc and a gc aware constructors. Some
methods can only be called if the object is constructed with a
particular constructor (e.g, Insert and PutPrototypeTransition).

Note: Most usages of this class is done by constructing an object and
calling a single method:
`TransitionAccessor(...).Method(...)`
So we can easily change them to a static method.

This CL:
1. Adds DISALLOW_GARBAGE_COLLECTION to the class.
2. Makes methods that can trigger GC static.
3. Creates static helper functions that wrap the class in a different
scope, since TransitionsAccessor now forces the scope to disallow gc.
4. Removes now unnecessary "Reload" logic.

Bug: chromium:1295133, v8:12578
Change-Id: I85484e7235fbd5e69894e26f5e1c491c6f69635e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3450416Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79051}