[Discover] Allow to store the configured ES|QL visualization v3 (with migrations)

[jughosta]

Tmp PR for running CI. Main PR: #175227

Includes:

• Creates saved-search-so plugin and saved-search package to extract some common code from saved-search plugin and avoid circular deps when requiring lens plugin
• Adds Lens migrations for the new visContextJSON attribute in a saved search SO
• Adds tests for lens migrations

[github-actions]

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[jughosta]

/ci

[jughosta]

/ci

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 6e28a48

Failed CI Steps

• FTR Configs #15

Test Failures

• [job] [logs] FTR Configs #15 / cloud_security_posture GET /internal/cloud_security_posture/status STATUS = INDEX_TIMEOUT TEST Should return index-timeout when installed cnvm, has findings only on logs-cloud_security_posture.vulnerabilities-default* and it has been more than 4 hours minutes since the installation

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
savedSearch	47	49	+2
unifiedHistogram	121	128	+7
total			+9

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/saved-search	-	3	+3
savedSearch	77	78	+1
unifiedHistogram	23	27	+4
total			+8

Async chunks

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

id	before	after	diff
discover	572.3KB	573.5KB	+1.1KB
lens	1.4MB	1.4MB	+113.0B
observabilityAIAssistant	168.6KB	168.6KB	+45.0B
unifiedHistogram	70.3KB	75.9KB	+5.7KB
total			+7.0KB

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/saved-search	-	3	+3
savedSearch	3	2	-1
unifiedHistogram	2	4	+2
total			+4

Page load bundle

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

id	before	after	diff
savedSearch	11.5KB	11.5KB	-2.0B
unifiedHistogram	6.4KB	7.6KB	+1.2KB
total			+1.2KB

Unknown metric groups

API count

id	before	after	diff
@kbn/saved-search	-	3	+3
savedSearch	78	79	+1
unifiedHistogram	55	60	+5
total			+9

ESLint disabled in files

id	before	after	diff
savedSearch	1	0	-1

References to deprecated APIs

id	before	after	diff
savedSearch	9	4	-5
savedSearchSo	-	5	+5
total			-0

Total ESLint disabled count

id	before	after	diff
savedSearch	3	2	-1

History

• 💔 Build #192382 failed 5eabc7c
• 💔 Build #192360 failed 4dea461
• 💔 Build #192351 failed e3e728b
• 💔 Build #192343 failed 5010ce2

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