[Enterprise Search] Added Credentials Page

[JasonStoltz]

Summary

This PR ports the Credentials view from the stand-alone App Search into the Kibana App Search Plug-in.

Remaining work

• Implement main credentials page with credentials list and api endpoint
• Create a stub Flyout (used for creating and editing individual credentials) to be further implemented in a follow up PR
• Create a logic only PR that includes the following:
  • Logic
  • API endpoints and tests
  • Integrate API Error Handling ([Enterprise Search] Update enterpriseSearchRequestHandler to manage range of errors + add handleAPIErrors helper #77258)
• Backport specs for all remaining views and code
• Handle Empty State for list
• Handle Loading State
• Polish UI details (@daveyholler to review)

Next PR:

• Flyout.
• Should be simple, almost all logic is backported and tested
• Will need roles to be available in AppLogic

Changes

• Converted from STUI table to EUI table
• (More to come)

Checklist

Delete any items that are not applicable to this PR.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• This was checked for keyboard-only and screenreader accessibility
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser
• This was checked for cross-browser compatibility

For maintainers

• This was checked for breaking API changes and was labeled appropriately

[kibanamachine]

💔 Build Failed

• continuous-integration/kibana-ci/pull-request
• Commit: a09a8d3
• Pipeline Steps (look for red circles / failed steps)
• Interpreting CI Failures

Failed CI Steps

• Check Types

Build metrics

@kbn/optimizer bundle module count

id	value	diff	baseline
enterpriseSearch	283	+13	270

async chunks size

id	value	diff	baseline
enterpriseSearch	453.3KB	+23.6KB	429.7KB

History

• 💔 Build #74262 failed 394effc036d7c8d8dff8536596058b6878bc33f2
• 💔 Build #73874 failed f6c9ad6a4551c12c8933116593c6d0db3a32945c
• 💔 Build #73842 failed f7af8da5cf1a117278d547f0446c35af51531820

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[daveyholler]

This looks plenty good to me 🤘