[7.x] Transaction type handling and breakdown chart (#83587)

[sorenlouv]

Backports the following commits to 7.x:

• Transaction type handling and breakdown chart (Transaction type handling and breakdown chart #83587)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: c71dab6

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
apm	1152	1153	+1

Async chunks

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

id	before	after	diff
apm	3.1MB	3.1MB	-487.0B

Page load bundle

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

id	before	after	diff
observability	68.6KB	69.8KB	+1.2KB

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