[8.x] [Epic] AI Insights + Assistant - Add "Other" option to the existing OpenAI Connector dropdown list (#8936) (#194831)

[kibanamachine]

Backport

This will backport the following commits from main to 8.x:

• [Epic] AI Insights + Assistant - Add "Other" option to the existing OpenAI Connector dropdown list (#8936) (#194831)

Questions ?

Please refer to the Backport tool documentation

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 78fd515

Failed CI Steps

• Jest Tests #11

Test Failures

• [job] [logs] Jest Tests #11 / CreateDetectionRuleFromVulnerability generateVulnerabilitiesRuleQuery should generate correct query for a vulnerability

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
searchPlayground	165.4KB	165.9KB	+591.0B
securitySolution	20.6MB	20.6MB	+104.0B
stackConnectors	580.4KB	584.1KB	+3.7KB
total			+4.4KB

Page load bundle

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

id	before	after	diff
stackConnectors	56.1KB	56.1KB	+16.0B

cc @e40pud