[7.x] [Fleet] Add preconfiguration to kibana config (#96588)

[Zacqary]

Backports the following commits to 7.x:

• [Fleet] Add preconfiguration to kibana config ([Fleet] Add preconfiguration to kibana config #96588)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 6b35a3a
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
fleet	450	451	+1

Async chunks

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

id	before	after	diff
fleet	711.2KB	711.5KB	+327.0B

Page load bundle

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

id	before	after	diff
fleet	345.4KB	345.8KB	+425.0B

Saved Objects .kibana field count

Every field in each saved object type adds overhead to Elasticsearch. Kibana needs to keep the total field count below Elasticsearch's default limit of 1000 fields. Only specify field mappings for the fields you wish to search on or query. See https://www.elastic.co/guide/en/kibana/master/development-plugin-saved-objects.html#_mappings

id	before	after	diff
fleet-preconfiguration-deletion-record	-	2	+2

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