Remove $.ajax usage, add lorisFetch wrapper, and drop ajax-dependent vendor libs

[Montekkundan]

Summary

• Replacec remaining $.ajax calls with fetch and a new lorisFetch wrapper.
• Centralize 401/login handling so session expiry prompts are consistent.
• Remove ajax-dependent vendor bundles (autocomplete + webshims).

Why

• Replace jQuery $.ajax with the javascript fetch API #4213 priority: jQuery should not be a dependency; $.ajax was a primary blocker.
• A small wrapper keeps 401/login behavior consistent without duplicating logic.
• lorisFetch centralizes 401/login modal behavior so all fetch calls handle session expiry consistently.

What changed

• Added jslib/lorisFetch.js and wired it into global usage.
• Replaced ajax usage across candidate_parameters, dqt, configuration, statistics, user_accounts, document_repository.
• Removed htdocs/js/jquery/jquery.autocomplete.js, htdocs/js/shims/*, and modules/brainbrowser/js/html5-minc-viewer.min.js.

Scope note

This PR removes $.ajax usage and ajax‑dependent vendor libs only.
Other jQuery usages remain and should be handled in a separate refactor.

Verification

• rg "\$\.ajax|\$\.get|\$\.post" returns no matches.

Tests

• npm run lint:js (warnings only, no errors)
• npm run build (warnings about bundle size; build succeeds)

[driusan]

Can you please split this up into multiple PRs that each do one thing and can be reviewed independently?

A good set of PRs would be:

1. One that removes the files that you're removing
2. One that adds the "lorisfetch" that you've created
3. One per module that uses it

There seems to be changes unrelated to $.ajax in this PR as well (ie. .fadeTo) that should also be separated.

[Montekkundan]

Closing this PR in favor of split PRs, as requested.

Opened:

1. Remove ajax-dependent vendor bundles (webshims + autocomplete + minc viewer) Remove ajax-dependent vendor bundles (webshims + autocomplete + minc viewer) #10332
2. Add lorisFetch wrapper for centralized 401/login handling Add lorisFetch wrapper for centralized 401/login handling #10333
3. candidate_parameters: replace $.ajax with lorisFetch candidate_parameters: replace $.ajax with lorisFetch #10334
4. dqt: replace $.ajax with lorisFetch dqt: replace $.ajax with lorisFetch #10335
5. configuration: replace $.ajax with lorisFetch configuration: replace $.ajax with lorisFetch #10336
6. document_repository: replace $.ajax with lorisFetch document_repository: replace $.ajax with lorisFetch #10337
7. statistics: replace $.ajax with lorisFetch statistics: replace $.ajax with lorisFetch #10338
8. user_accounts: replace $.ajax with lorisFetch user_accounts: replace $.ajax with lorisFetch #10339

Notes:

• Each module PR is scoped to $.ajax replacement for that module only.
• Unrelated changes (.fadeTo) are excluded from these module AJAX PRs.