[Kibana] Native connectors for outlook_cloud + exchange_server

[Jan-Kazlouski-elastic]

Parent

Part of #4264
Blocked by: exchange_server extract + outlook_cloud feature-complete (through incremental)

Summary

Add Kibana native connector definitions for outlook_cloud and exchange_server. Planning preference: hide legacy outlook from the create-connector flow on versions that include the new connectors (confirm in #4346).

Scope

• PR in elastic/kibana against packages/kbn-search-connectors/types/native_connectors.ts (and related UI)
• RCF fields for both new service types
• Legacy outlook: prefer hide from create flow (existing connectors keep working; new creates cannot select it) — subject to [Outlook] Epic design: Graph migration, connector split, regression contract #4346 confirmation
• Coordinate release with connectors packages shipping the new service types

Acceptance criteria

• Native UI can create/configure outlook_cloud and exchange_server
• Legacy outlook create-flow behavior matches confirmed [Outlook] Epic design: Graph migration, connector split, regression contract #4346 decision
• Existing legacy outlook connectors remain visible/manageable
• Kibana PR linked from this issue; ships with connectors release plan

Notes

Work primarily lives in elastic/kibana. Keep this issue in elastic/connectors for epic tracking under #4264.