[7.x] [Search] Search Sessions with relative time range (#84405)

[Dosant]

Backports the following commits to 7.x:

• [Search] Search Sessions with relative time range ([Search] Search Sessions with relative time range  #84405)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: b782c0f

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
data	613	615	+2

Async chunks

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

id	before	after	diff
dashboard	200.2KB	200.3KB	+172.0B
data	271.0KB	271.0KB	+1.0B
discover	504.5KB	504.3KB	-175.0B
lens	1.1MB	1.1MB	-224.0B
visualize	132.1KB	132.4KB	+325.0B
total			+99.0B

Page load bundle

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

id	before	after	diff
data	1006.4KB	1008.6KB	+2.2KB
visualizations	171.4KB	171.1KB	-236.0B
total			+2.0KB

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