Migrate server-side Root and Server to packages

[pgayvallet]

Summary

Fix #144255

Create the @kbn/core-root-server-internal package, and move Root, Server and bootstrap to it.

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)

[TinaHeiligers]

What a nice surprise that the migration turned out t obe relatively simple, now that all the subdomains in core have been migrated!
LGTM

[pgayvallet]

@elasticmachine merge upstream

[pgayvallet]

@elasticmachine merge upstream

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 8a1c799

Metrics [docs]

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/core-root-server-internal	-	22	+22

Any counts in public APIs

Total count of every any typed public API. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats any for more detailed information.

id	before	after	diff
@kbn/core-root-server-internal	-	1	+1

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id	before	after	diff
@kbn/core-lifecycle-server-internal	0	3	+3

Unknown metric groups

API count

id	before	after	diff
@kbn/core-root-server-internal	-	23	+23

ESLint disabled in files

id	before	after	diff
osquery	1	2	+1

ESLint disabled line counts

id	before	after	diff
@kbn/core-root-server-internal	-	3	+3
core	10	7	-3
enterpriseSearch	19	21	+2
fleet	59	65	+6
osquery	108	113	+5
securitySolution	441	447	+6
total			+19

Total ESLint disabled count

id	before	after	diff
@kbn/core-root-server-internal	-	3	+3
core	10	7	-3
enterpriseSearch	20	22	+2
fleet	67	73	+6
osquery	109	115	+6
securitySolution	518	524	+6
total			+20

History

• 💔 Build #87865 failed ac6e726
• 💔 Build #87851 failed 8db51be
• 💛 Build #87381 was flaky a165a8d
• 💚 Build #87359 succeeded 85ee2ff
• 💔 Build #87057 failed 6f8fd58

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream