refactor(modals): remove jquery in ts/modals (@fcasibu)

[fcasibu]

Description

Refactor frontend/ts/modals/* to replace jQuery (some still TODO). I've also modified dom.ts to add setValue for ElementsWithUtils<ElementWithValue> instance. Still trying to grep the whole flow/codebase, so usage of qsr or qs is uncertain (Probably use qsr always? Can find non-existing elements that way or developer error)

While doing the refactor, also stumbled upon things that I have questions for (didn't made any changes to them), which I thought can be improved:

• custom-generator.ts:146: The user is able to write minLength > maxLength. Is this behavior correct?
• custom-test-duration.ts:99: It seems like parseInput, always expects a non nullable string, and we seem to always expect that #customTestDurationModal input to always exist (so I used qsr), which makes the conditions val !== null, !isNaN(val) seem to be unnecessary (val is never null or NaN, tbh also isFinite, and val >= 0 is the only valid condition)
• custom-text.ts:169: These elements does not seem exist .randomWordsCheckbox, .replaceNewlineWithSpace, .typographyCheck, and .delimiterCheck (last two is just in a challenge file). Are they good to remove?
• edit-preset.ts:146: Noticed that we're not updaitng the DOM, since for the most part, in the logic, we mostly use state.checkboxes, so no problem happens, but I think it is also a good idea to update the DOM to match current state? Either calling updateUI() here or just changing the checked value inline.

Checks

• Adding/modifying Typescript code?
  • I have used qs, qsa or qsr instead of JQuery selectors.
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Related #7186

[fcasibu]

Can likely just query for a specific selector, but uncertain. Same for line 237