[ResponseOps][Connectors] Support for OpenAI Connector UI to support URL without dots

[georgianaonoleata1904]

Closes #202423

Summary

This PR updates the URL validation logic in the UI to allow hostnames without a dot character. This brings the UI behavior in line with the API, which already accepts such URLs.

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)

[cnasikas]

I am a bit skeptical about configuring the form lib to allow domains without dots. We can either create our custom URL validator (using the URL class) or the form lib supports out of the box without any configuration. I would love to hear the opinion of the @elastic/kibana-management team.

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 2788765

Failed CI Steps

• FTR Configs #34

Test Failures

• [job] [logs] FTR Configs #34 / discover/embeddable discover saved search embeddable "before all" hook for "can save a search embeddable with a defined rows per page number"

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
stackConnectors	607.0KB	607.1KB	+78.0B

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
esUiShared	88.4KB	88.4KB	+53.0B
triggersActionsUi	100.0KB	100.2KB	+211.0B
total			+264.0B

History

• 💛 Build #293080 was flaky ee35ecc
• 💚 Build #293012 succeeded a4eb653
• 💚 Build #292833 succeeded aefbbed
• 💔 Build #292671 failed ca95314

cc @georgianaonoleata1904

[mattkime]

codeowner changes lgtm