Deangularize courier/search source

[lukasolson]

Related: #46315, #42639

Deangularization (PR: #45235):

• courier/fetch/request/search_request: Remove (refactor & move abort to use abort signal in searchSource.fetch, ~1 day)
• courier/fetch/request/serialize_fetch_params: Promise, sessionId, config, esShardTimeout (~2 hours)
• courier/fetch/call_client: Promise, es, config, sessionId, esShardTimeout, KbnUrlProvider (which relies on state) (~1 day)
• courier/fetch/call_response_handlers: Remove (return promise to the response in searchSource.fetch) (~2 hours)
• courier/fetch/continue_incomplete: Remove (incomplete requests aren't ever restarted) (~2 hours)v
• courier/fetch/fetch_now: Promise (~1 hour)
• courier/fetch/fetch_soon: Promise, config (~1 hour)
• courier/fetch/is_request: Remove (~1 hour)
• courier/search_poll: Remove and move events to timeFilter service (~1 day)
• courier/search_request_queue: Remove (searchSource can handle its own queues) (~2 hours)
• courier/search_source/_normalize_sort_request: config (~1 hour)
• courier/search_source/search_source: Promise, config (~2 hours)
• courier/search_strategy/default_search_strategy: Promise, config (~1 hour)
• courier/courier: Remove (everywhere should be now using searchSource.fetch) (~1 day)

[elasticmachine]

Pinging @elastic/kibana-app-arch