[KS-79] Remote trigger setup

[bolekk]

1. Fully set up a (hardcoded) capability DON in Syncer and move fake Mercury producer over there.
2. Refactor remote Aggregator interface to reduce marshaling steps.
3. Avoid redundant calls to RegisterTrigger.
4. Minor change to Prometheus config in Peer Wrapper.

[github-actions]

I see you updated files related to core. Please run pnpm changeset in the root directory to add a changeset as well as in the text include at least one of the following tags:

#nops : For any feature that is NOP facing and needs to be in the official Release Notes for the release.
#added : For any new functionality added.
#changed : For any change to the existing functionality. 
#removed : For any functionality/config that is removed.
#updated : For any functionality that is updated.
#deprecation_notice : For any upcoming deprecation functionality.
#breaking_change : For any functionality that requires manual action for the node to boot.
#db_update : For any feature that introduces updates to database schema.
#wip : For any change that is not ready yet and external communication about it should be held off till it is feature complete.
#bugfix - For bug fixes.
#internal - For changesets that need to be excluded from the final changelog.

[krehermann]

prefer to make the error a type or var and check with assert/require ErrorIs rather than string matching.

this approach will also play nicely with wrapping errors via %w

[bolekk]

hmm I'm not sure how to do that and still support wrapped inner errors - do you have an example somewhere?
I also realized that the expected string matching here doesn't actually work that way so I'm removing it.

[cl-sonarqube-production]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
38.8% Coverage on New Code
0.0% Duplication on New Code

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