[7.x] [Maps] add on-prem EMS config (#82525)

[thomasneirynck]

Backports the following commits to 7.x:

• [Maps] add on-prem EMS config ([Maps] add on-prem EMS config #82525)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 72ebc15

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
maps	620	621	+1
mapsLegacy	186	188	+2
total			+3

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
maps	2.8MB	2.8MB	-186.0B
mapsLegacy	721.1KB	721.1KB	+30.0B
total			-156.0B

Distributable file count

id	before	after	diff
default	43117	43120	+3
oss	22750	22752	+2

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
maps	154.1KB	155.7KB	+1.7KB
mapsLegacy	92.6KB	94.3KB	+1.7KB
total			+3.4KB

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@elasticmachine merge upstream