[8.1] [plugin-discovery] move logic to a package (#128684)

[spalger]

Backport

This will backport the following commits from main to 8.1:

• [plugin-discovery] move logic to a package (#128684)

Questions ?

Please refer to the Backport tool documentation

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: af09493
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• Webpack Bundle Analyzer

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/dev-utils	207	199	-8
@kbn/plugin-discovery	-	27	+27
total			+19

Unknown metric groups

API count

id	before	after	diff
@kbn/dev-utils	286	277	-9
@kbn/plugin-discovery	-	28	+28
total			+19

ESLint disabled in files

id	before	after	diff
apm	15	14	-1
osquery	5	4	-1
securitySolution	68	67	-1
uptime	5	4	-1
total			-4

ESLint disabled line counts

id	before	after	diff
apm	94	91	-3
enterpriseSearch	7	6	-1
osquery	121	118	-3
uptime	48	42	-6
total			-13

References to deprecated APIs

id	before	after	diff
canvas	70	64	-6
dashboard	90	84	-6
data	487	477	-10
dataEnhanced	49	43	-6
dataViewFieldEditor	25	14	-11
discover	219	201	-18
fleet	14	10	-4
lens	237	185	-52
management	2	1	-1
maps	1298	817	-481
monitoring	53	41	-12
screenshotting	12	8	-4
stackAlerts	183	157	-26
upgradeAssistant	8	3	-5
visDefaultEditor	205	155	-50
visTypeTimeseries	427	377	-50
visTypeVega	25	24	-1
visualizations	114	100	-14
total			-757

Total ESLint disabled count

id	before	after	diff
apm	109	105	-4
enterpriseSearch	7	6	-1
osquery	126	122	-4
securitySolution	513	512	-1
uptime	53	46	-7
total			-17

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