[Meta] Audit createPointInTimeFinder usage in core code

[TinaHeiligers]

Part of #203017
Audit core code for createPointInTimeFinder() usage where all results are loaded in memory

Code	Line #	Line #	Line #	Team	Verified?	Issue (if needed)/comments
src/plugins/ftr_apis/server/routes/kbn_client_so/clean.ts	33			@elastic/kibana-core	Yes
src/plugins/kibana_usage_collection/server/collectors/application_usage/telemetry_application_usage_collector.ts	72	110		@elastic/kibana-core	Yes	doesn't store everything in memory
src/plugins/kibana_usage_collection/server/collectors/application_usage/rollups/total.ts	32	55		@elastic/kibana-core	Yes	doesn't store everything in memory
src/plugins/kibana_usage_collection/server/collectors/common/counters.ts	34			@elastic/kibana-core	Yes	Uses paginated find with targeted search fields #204676
src/plugins/kibana_usage_collection/server/collectors/ui_metric/telemetry_ui_metric_collector.ts	52			@elastic/kibana-core	Yes	doesn't store everything in memory
packages/core/saved-objects/core-saved-objects-api-server/src/saved_objects_client.ts	378 (ts doc example)	393 (SO client type definition)		@elastic/kibana-core	Yes
packages/core/saved-objects/core-saved-objects-api-server/src/saved_objects_repository.ts	530 (ts doc example)	541 (repository api type definition)		@elastic/kibana-core	yes
packages/core/saved-objects/core-saved-objects-api-server-internal/src/saved_objects_client.ts	181 (core SO repository API)	185 (core SO repository API)		@elastic/kibana-core	Yes
packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/repository.ts	548 (Core SO PIT implementation, passthrough)			@elastic/kibana-core	Yes
packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/apis/internals/find_legacy_url_aliases.ts	38 (aggregates results & closes PIT)			@elastic/kibana-core	Yes
packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/apis/utils/find_shared_origin_objects.ts	48 (aggregates)			@elastic/kibana-core	Yes
packages/core/saved-objects/core-saved-objects-import-export-server-internal/src/export/saved_objects_exporter.ts	159			@elastic/kibana-core	Yes

[TinaHeiligers]

Audit complete with no findings of inefficient use