Implement top-frame-module loading for ES6 module.
This has been marked as todo in #96510 in order to
be implemented in a separately testable patch.

Migrate EXT:redirect and EXT:install to make use of this.

Resolves: #96610
Related: #96510
Related: #96323
Releases: main
Change-Id: I699a7a39beb788c843e3c8292e29bf3db97e8cd9