Fix containers forms and remove unused forms

[britneywwc]

Done

• Update /containers#get-in-touch dynamic form design and logic - consistent with other dynamic forms. Fixes 500 on submission.
• Remove unused kernel-form.js

QA

• Go to https://ubuntu-com-14183.demos.haus/containers#get-in-touch
  • Submit form and check payload is correct
• Go to prod: https://ubuntu.com/internet-of-things#beta-signup
  • Go to demo: https://ubuntu-com-14183.demos.haus/internet-of-things#beta-signup
  • See that nothing happens for both prod and demo, the triggering hash does not invoke the modal
  • The triggering hash is only called in one line throughout the entire file, and it redirects users to /iot#beta-signup page.

Issue / Card

Fixes WD-14054

Screenshots

[If relevant, please include a screenshot.]

Help

QA steps - Commit guidelines

[webteam-app]

Demo

Jenkins

demos.haus

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.57%. Comparing base (753131a) to head (8381d1e). Report is 21 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #14183 +/- ## ======================================= Coverage 69.57% 69.57% ======================================= Files 120 120 Lines 3412 3412 Branches 1176 1176 ======================================= Hits 2374 2374 Misses 1013 1013 Partials 25 25 ```

[akbarkz]

@britneywwc I noticed there is an error in dynamic-forms.js file when you close a containers form modal. Here's the screenshot of the error. Can you please find out why?