Reland "[iOS] ShouldDetachPageContextScript provider API and public impl"

Updated the constants to fix the static initializer check issue.

This is a reland of commit ea19be355124920cd5aa3a7128f70d2d786d2efb

Original change's description:
> [iOS] ShouldDetachPageContextScript provider API and public impl
>
> This CL adds the new API and public implementations. These are parts of
> a script which are injected into a larger script. The public
> implementations just return false.
>
> This is part of a multi-CL change:
> -> crrev.com/c/6652410
>    crrev.com/i/8355859
>    crrev.com/c/6653620
>
> Bug: 422506000
> Change-Id: I4dde56a8d2113d2f9a50106f0a7644f99882c1d0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6652410
> Reviewed-by: Joemer Ramos <joemerramos@google.com>
> Commit-Queue: Nicolas MacBeth <nicolasmacbeth@google.com>
> Reviewed-by: Sergio Collazos <sczs@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1475762}

Bug: 422506000
Change-Id: I61bc666fcffa8162e76ab85e89d7062881ea7052
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6653029
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Nicolas MacBeth <nicolasmacbeth@google.com>
Reviewed-by: Joemer Ramos <joemerramos@google.com>
Cr-Commit-Position: refs/heads/main@{#1476138}