[9.4] Remove remaining Trace Explorer implementation (#262265)

[kibanamachine]

Backport

This will backport the following commits from main to 9.4:

• Remove remaining Trace Explorer implementation (#262265)

Questions ?

Please refer to the Backport tool documentation

[elasticmachine]

Pinging @elastic/obs-presentation-team (Team:obs-presentation)

[macroscopeapp]

Approvability

Verdict: Would Approve

Feature removal PR that deletes the Trace Explorer implementation entirely - components, routes, API endpoints, tests, and translations. All changes are deletions or cleanup of references to deleted code. Author owns all modified files.

^{Macroscope would have approved this PR. Enable approvability here.}

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: dc6fba1

Failed CI Steps

• FTR Configs #109

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
apm	2126	2119	-7

Async chunks

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

id	before	after	diff
apm	2.7MB	2.7MB	-11.3KB
securitySolution	11.7MB	11.7MB	-868.0B
total			-12.1KB

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
apm	121	119	-2

Unknown metric groups

async chunk count

id	before	after	diff
apm	85	83	-2

cc @sbelastic