Improve current e2e tests reliability

[jardakotesovec]

Describe the bug
Seems that lots of runs are failing on keyword component, in particular its test 60-content/CcorinoSubmission.cy.js :

request Saved
request Saved
request Saved
get #metadata-keywords-selected-en
contains Professional Development
get #metadata-keywords-selected-en
contains Social Transformation
saved as log in: cypress/logs/failed-cypress-tests-data-60-content-ccorino-submission-data-suite-ccorino-sends-to-review-and-selects-pre-existing-keywords.json
    ✓ Logins as a section editor and recommends accept (14304ms)


  2 passing (46s)
  1 failing

  1) Data suite: Ccorino
       Sends to review and selects pre-existing keywords:
     AssertionError: Timed out retrying after 10000ms: Expected to find content: 'Social Transformation' within the element: <div#metadata-keywords-selected-en.pkpAutosuggest__inputWrapper.pkpFormField__input.pkpAutosuggest__inputWrapper--multilingual> but never did.

What application are you using?
OJS, OMP or OPS version main

Additional information
Failed job example - https://github.com/pkp/ojs/actions/runs/9171483181/job/25215892896

[jardakotesovec]

When typing in the keyword - it would start multiple requests to get the list of keywords. Addressing that seems improved tests reliability.

ui-library: pkp/ui-library#353

[jardakotesovec]

All tests passed on PR, but not after merging to main, its still moody on that keyword input.

Sometimes it fails when running cypress locally as well - but its very rare.. so difficult to trust the results.

Trying to make it type slower to see whether it improves reliability on CI:
pkp/ojs#4282

[jardakotesovec]

Slowing down the typing in the keyword input seems to improve reliability enough (all tests are passed on OJS main now).
Taking it as good enough improvement for now and closing.