[7.x] [Uptime] [Synthetics Integration] Add functional tests for Synthetics Integration (#100161)

[kibanamachine]

Backports the following commits to 7.x:

• [Uptime] [Synthetics Integration] Add functional tests for Synthetics Integration ([Uptime] [Synthetics Integration] Add functional tests for Synthetics Integration #100161)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 868785c
• Storybooks Preview

Metrics [docs]

Async chunks

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

id	before	after	diff
uptime	1.2MB	1.2MB	+1.9KB

Unknown metric groups

References to deprecated APIs

id	before	after	diff
canvas	29	25	-4
crossClusterReplication	8	6	-2
fleet	4	2	-2
globalSearch	4	2	-2
indexManagement	12	7	-5
infra	5	3	-2
licensing	18	15	-3
monitoring	109	56	-53
total			-73

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

cc @dominiqueclarke