[7.x] [APM] Add APM agent config options (#84678)

[eyalkoren]

Backports the following commits to 7.x:

• [APM] Add APM agent config options ([APM] Add APM agent config options #84678)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: fa8f775

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	+2.3KB

Distributable file count

id	before	after	diff
default	43789	43790	+1

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