fix(validator): fix incomplete types and wrong tests

[EdamAme-x]

close: #4520

This PR fixes the incomplete work from the PR I created a year ago. (#3119)
I forgot to update the types for the input schemas such as $get and $post, and this mistake was caused by incorrect tests.
This PR should resolve everything. Sorry about that.

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[EdamAme-x]

Hi @NamesMT.
Can you review this?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.52%. Comparing base (4960c06) to head (206ef1d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4521   +/-   ##
=======================================
  Coverage   91.52%   91.52%           
=======================================
  Files         172      172           
  Lines       11221    11221           
  Branches     3255     3255           
=======================================
  Hits        10270    10270           
  Misses        950      950           
  Partials        1        1           

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[NamesMT]

Hi @EdamAme-x
Change in this PR looks good to me, but I don't quite get why did #3120 added ParsedFormValue and T generic to ValidationTargets yet.
What will happen if we revert #3120 changes and simply just update FormValue to string | Blob and update the related tests if needed?