Add observability logs metadata URL API
What does this MR do and why?
Adding logs metadata search URL to the set observability API config so that it can be later used by the frontend (required for gitlab-org/opstrace/opstrace#2782 (closed)).
MR acceptance checklist
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Screenshots or screen recordings
No visual changes
How to set up and validate locally
Nothing to repro.
Edited by Daniele Rossetti