Install visualizations directly to static path, avoid duplication

[guerler]

Requires #20303. This PR changes the installation target for visualizations from config/visualizations to the static path directly. It also removes the unused html visualization type and degrades the Mako mechanism by disabling the registration of new Mako-based visualizations. The only remaining Mako template is moved to the default template directory and will be removed once the last four Mako-based visualizations are migrated to npm.

How to test the changes?

(Select all options that apply)

• [ ] I've included appropriate automated tests.
• [x] This is a refactoring of components with existing test coverage.
• [ ] Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• [x] I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[guerler]

Failing tests are unrelated.

[guerler]

Thank you for the review @davelopez. I would like to merge this so I can switch between branches without having to reinstall visualizations. I am confident that the mako handling is solid, but if anyone has comments or notices something I can make adjustments. Thank you.

[davelopez]

Fair enough! I'll merge it now. Thanks!