[maps] remove geojson implementation for displaying individual elasticsearch documents

[nreese]

There are 2 implementation paths for displaying individual elasticsearch documents in maps

1. geojson: documents fetched from _search API. ASCII hits results are transformed into geojson feature collection and added to map as 'geojson' maplibre source.
2. vector tiles: documents fetched from _mvt API. Binary vector tiles results added to map as 'vector' maplibre source.

There are 3 benefits to removing geojson implementation

1. Simplify user interface: Current system leaks implementation details to the user. In the screen shot below, users are asked to pick between geojson and vector tiles.
   
2. performance: geojson is significantly slower than vector tiles. Large shapes with numerous vertices have huge ASCII response payloads.
3. maintenance: Less code paths are easier to maintain

Geojson implementation can not be removed until the following feature gaps are closed:

• Formatted labels
• Multiple term joins
• Data driven styling from term join metrics with 'Label', 'Label size', icon 'Symbol size', and 'Symbol orientation' style properties
• Data driven styling from scripted fields

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[nreese]

In order to provide better transparency of priorities, issues that will not be prioritized within the next 24 months are being closed.

Tracking request in Maps ice box #154870