(feat) Remove some cruft and unused dependencies

[denniskigen]

Requirements

• This PR has a title that briefly describes the work done, including the ticket number if there is a ticket.
• My work conforms to the OpenMRS 3.0 Styleguide and design documentation.
• My work includes tests or is validated by existing tests.

Summary

This PR removes unused code and dependencies from the Form Entry library, including:

• Removing a custom proxy config only relevant in the AMPATH ecosystem
• Removing the slick-carousel package and related code
• Deleting an unused build script
• Removing the unused @material/mwc-switch dependency
• Replacing the default Angular favicon with OpenMRS favicon sprite
• Deleting the SystemJS script import in index.html
• Updating lib and module tsconfig targets to ES2022 in the tsconfig.json file

I've tested that the library works in the patient chart clinical forms workspace (see the screenshot below).

Screenshots

Working clinical form

Related Issue

None

Other

None

[ibacher]

Thanks @denniskigen! This kind of clean-up is great to see!