[ObsUX] Fix layout in KeyValueFilterList component

[MiriamAparicio]

Closes #168129

What was done

There was a change in EuiDescriptionList this component was updated to use CSS grid, and was the cause of the misalignment, it's been fixed with the new prop columnWidths
Also, the grid was creating a gap between the borders of the title and description of the list item.
After checking with @boriskirov, we decided to get rid of the border.

BEFORE

AFTER

[elasticmachine]

Pinging @elastic/apm-ui (Team:APM)

[apmmachine]

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• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
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[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 9c1814c

Failed CI Steps

• FTR Configs #27
• Osquery Cypress Tests #6

Test Failures

• [job] [logs] FTR Configs #27 / cloud_security_posture Cloud Posture Dashboard Page Kubernetes Dashboard displays accurate summary compliance score

Metrics [docs]

Async chunks

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

id	before	after	diff
apm	3.7MB	3.7MB	-50.0B

History

• 💔 Build #168017 failed 0281b8d
• 💔 Build #167858 failed 3474775
• 💔 Build #167727 failed 6d29127
• 💔 Build #167628 failed 7704e10

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

[sorenlouv]

Thanks