[8.x] Removes kbn-std/unset as it's not used anywhere (#193298)

[kibanamachine]

Backport

This will backport the following commits from main to 8.x:

• Removes kbn-std/unset as it's not used anywhere (#193298)

Questions ?

Please refer to the Backport tool documentation

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: fd61a18

Failed CI Steps

• FTR Configs #35

Test Failures

• [job] [logs] FTR Configs #35 / aiops change point detection attaches change point charts to a dashboard

Metrics [docs]

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/std	72	70	-2

Page load bundle

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

id	before	after	diff
kbnUiSharedDeps-srcJs	3.4MB	3.4MB	-229.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/std	111	108	-3

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

cc @rudolf