[data views] telemetry is too resource intensive, skip field loading

[mattkime]

From #151064

Some customers have thousands of data views and thousands of fields so running telemetry can be very resource intensive. Lets skip loading fields as the primary culprit is likely json.parse which can block the main thread when parsing large json.

src/plugins/data_views/server/register_index_pattern_usage_collection.ts:85 - loads full data views even though just scripted and runtime fields are needed.

x-pack/plugins/maps/server/maps_telemetry/index_pattern_stats/index_pattern_stats_collector.ts - only needs geo fields

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[kertal]

+1 one for optional & selective data view fields fetching, also other areas in Kibana using data views would benefit from that.
On top of that, much more effort, but also something to think about, combining data views, fetch fields with one request, this could improve the following stats collection:

kibana/x-pack/plugins/maps/server/maps_telemetry/index_pattern_stats/index_pattern_stats_collector.ts

Line 60 in a80bfb7

await asyncForEach(indexPatternIds, async (indexPatternId) => {

[mattkime]

I'm hoping this is the start of a proposal to address this - #152159

[kertal]

@mattkime I guess we can close this, right?