ci: stop releases failing on issue references they cannot resolve

[tkuhn]

The 1.27.1 release job exited 1 after the release had already shipped.

What happened

@semantic-release/github's success step resolves every issue reference in the released commits and comments on it — but it looks each number up in this repo, dropping any owner/repo qualifier. My commit message for #201 cited eclipse-rdf4j/rdf4j#4775, which became a lookup for knowledgepixels/nanopub-query#4775:

Failed step "success" of plugin "@semantic-release/github"
Error: Could not resolve to an issue or pull request with the number of 4775.
  type: 'NOT_FOUND', path: [ 'repository', 'issue4775' ]

Everything of substance had already completed by then — tag nanopub-query-1.27.1, the GitHub release, and Built and pushed image as nanopub/query, nanopub/query:1.27.1. The only casualty was the workflow's final "Update main branch after release" step, which never ran and left main two commits behind release (no changelog entry, stale snapshot version). That has been repaired by merging release into main; a re-run would not have fixed it, since with the tag present semantic-release finds nothing releasable and skips past.

The change

successCommentCondition: false on the github plugin. The guard in the plugin's success.js wraps the entire resolution block, so the failing GraphQL lookup never happens and no future upstream reference can take a release down with it.

This repo cites rdf4j issues constantly, so the next stray #N was a matter of time — worth removing the hazard rather than policing commit messages.

Deliberately kept: failure reporting (failComment/failTitle), which opens an issue in this repo and cannot hit the same lookup. Also unaffected is the changelog, which renders cross-repo references correctly — the 1.27.1 entry links eclipse-rdf4j/rdf4j#4775 to the right repository. Only the commenting step has this defect.

Verified the config parses with the plugin list intact and exactly one @semantic-release/github entry:

@semantic-release/commit-analyzer -> @semantic-release/release-notes-generator ->
@semantic-release/changelog -> @terrestris/maven-semantic-release ->
@semantic-release/github -> @semantic-release/git

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