[2.0] Fix Geo Location fields

[strawgate]

Fixes #436

Host and entity location fields were not working. This moves them to hass.entity.location and host.location from hass.entity.geo.location and host.geo.location.

This also introduces coverage tests for both.

Also removes a couple extra agent fields from the mapping while we're updating the mapping.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
__init__.py	0	0	100%
elasticsearch
__init__.py	142	13	90%	29, 50–55, 74, 93, 98, 212, 240–241
config_flow.py	159	0	100%
const.py	54	0	100%
diagnostics.py	8	0	100%
encoder.py	23	2	91%	42, 51
entity_details.py	113	0	100%
errors.py	12	0	100%
es_datastream_manager.py	42	1	97%	81
es_gateway.py	111	13	88%	16–18, 20, 89, 120–122, 124, 126, 137, 140, 143
es_gateway_8.py	225	60	73%	36–37, 54, 56–58, 60–61, 63–64, 66, 149, 169, 171, 173, 205, 237–238, 240, 245–246, 248, 264–268, 270, 273–276, 290–291, 308, 311–312, 314, 320–321, 325–326, 342–343, 346–347, 368–369, 375–377, 379–381, 383, 385–387, 389–390
es_integration.py	56	8	85%	39–40, 42–43, 96–97, 125–126
es_publish_pipeline.py	401	31	92%	69, 233, 241, 268–269, 278–279, 283–286, 288–289, 291–294, 296–299, 301–304, 366–367, 374–375, 387, 415
logger.py	62	0	100%
loop.py	52	0	100%
system_info.py	33	5	84%	34–37, 52
utils.py	10	0	100%
elasticsearch/datastreams
__init__.py	2	0	100%
index_template.py	2	0	100%
TOTAL	1507	133	91%

Tests	Skipped	Failures	Errors	Time
255	0 💤	0 ❌	0 🔥	17.729s ⏱️

[strawgate]

@legrego fixed the linting issues and updated the PR description to mention dropping the unused agent fields