docs: add synopsis to trace, lint, and config compile

Brendan Lynchrequested to merge
8263-add-synopsis-trace-lint-config into main

What does this MR do and why?

Adds Long (Synopsis) fields to three ci subcommands that were missing them, as part of the style guide audit identified in #8263 (closed).

Commands updated:

  • ci trace
  • ci lint
  • ci config compile

Content follows the documentation style guide and the GitLab CLI (glab) documentation style guide.

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