[Alerting] [Incident Management] Show "Created" column for alerts

[baileycash-elastic]

Summary

Implements #218172

Adds a "created" column for related alerts that shows either a relative time value or an absolute timestamp of when the alert was triggered/created if the duration is greater than 2 hours. This PR also sets up the time duration display logic to be separated out into a reusable component. Note that the issue asks for the column to be labeled "Triggered," but following a discussion with @nastasha-solomon on a this PR, I used the word "Created".

New Package

Implements the formatted date string as a reusable package.
The package has two new functions:

• Pass a timestamp as a millisecond numeric value, receive a string with the elapsed time in human readable format in either: hours/minutes OR days.
• Render a tooltip component that when hovered over displays the original timestamp in a human-readable format.
• This tooltip also toggles the display text between the elapsed time and the original timestamp. A threshold property is provided to decide when the toggle occurs, and is measured in hours, based on ticket requirements. (Our use case is 2 hours, but we can change it to 24+ for other cases. This process supports displaying elapsed time in days).

This package replaces the datetime formatter from the observability plugin utils, which is its own exported member.

[elasticmachine]

Pinging @elastic/obs-ux-management-team (Team:obs-ux-management)

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: ad3d6dd

Failed CI Steps

• FTR Configs #37

Test Failures

• [job] [logs] FTR Configs #37 / Reporting Functional Tests with Security enabled Access to Management > Reporting Schedules does not allow user to access schedules that does not have reporting privileges

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
observability	1323	1325	+2
profiling	276	279	+3
total			+5

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/elapsed-datetime-formatter	-	14	+14
observability	620	617	-3
total			+11

Async chunks

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

id	before	after	diff
observability	1.3MB	1.3MB	+1.8KB
profiling	360.1KB	360.6KB	+508.0B
total			+2.3KB

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id	before	after	diff
observability	23	22	-1

Page load bundle

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

id	before	after	diff
observability	93.5KB	93.0KB	-578.0B
profiling	18.4KB	18.5KB	+66.0B
total			-512.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/elapsed-datetime-formatter	-	17	+17
observability	627	624	-3
total			+14

History

• 💔 Build #312357 failed 843ae82
• 💔 Build #312339 failed 2331f7f

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