[8.0] [Uptime] Added step duraion in step list (#116266)

[kibanamachine]

Backports the following commits to 8.0:

• [Uptime] Added step duraion in step list ([Uptime] Added step duraion in step list #116266)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 470c2bb
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
uptime	646	648	+2

Async chunks

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

id	before	after	diff
observability	369.1KB	369.2KB	+84.0B
uptime	600.1KB	601.4KB	+1.3KB
total			+1.4KB

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

cc @shahzad31