[Remove Vuetify from Studio] Collection name input and validation in Channels - New collection #5298

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Sub-issue of #5060.

Complexity: Low

Summary

Remove Vuetify from the collection name input, including validation, on Channels > New collection page:

VForm, VTextField, and Vuetify-based validation is currently used:

Remove dependencies on Vuetify by:

• Replace VForm by <form>
• Replace VTextField by KTextbox
• Use generateFormMixin for validation

Do not refactor any other areas.

How to get there

• Login as user@a.com with password a
• Go to Channels > Collections
• Clikc New collection button

Guidance

• You can see https://github.com/learningequality/studio/pull/5089/files for a successfully finished similar task
• Find detailed guidance with many code examples in KDS documentation
• Read the project for more useful references

Out of Scope

• Do not refactor any other areas of the codebase

Expected UI/UX changes

• Minor visual differences naturally stemming from the use of KDS

Acceptance criteria

General

• The specification above is followed.
• Except for "Expected UI/UX changes," there are no functional or visual differences in user experience.
• All user interactions are manually tested with no regressions.
• Pull request includes screenshots.

a11y and i18n

See the project's "Guidance" for useful references.

• Implementation meets a11y standards
• All components are LTR and RTL compliant (preview with pnpm run devserver since :hot doesn't render RTL properly)
• All user-facing strings are translated properly
• The notranslate class been added to elements that shouldn't be translated by Google Chrome's automatic translation feature (e.g. user-generated text)
• Mobile experience is reasonable

Unit tests

• If there is a unit test suite already, it is meaningfully updated (even if tests don't fail)
• If there is no unit test suite, a new one is created. Do not use obsolete @vue/test-utils approach. Instead, use @testing-library/vue (Vue Testing Library).