Stop dynamically generating XModule JS

[kdmccormick]

Background

• We've already stopped dynamically generating XModule SCSS: Stop dynamically generating XModule SCSS #32292
• See the parent issue for more details: Remove special XModule asset handling #31624

Goal

All XModule JS should be committed to the repository rather than generated as part of the build process. Benefits:

• Delete xmodule/static_content.py (aka xmodule_assets), unblocking us from removing Python from the build process.
• Make XModule assets more similar to standard XBlock assets.
• Make it so XModule JS can be read by a human being; no tooling or special context necessary.

### PRs
- [ ] https://github.com/openedx/edx-platform/pull/32530
- [ ] https://github.com/openedx/edx-platform/pull/32480
- [ ] https://github.com/openedx/edx-platform/pull/32685