Please make all code scanning alerts visible in pull-requests

[praiskup]

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Bug

Body

The current code scanning toolkit only displays alerts directly in the modified
code (i.e., the code visible in the Files changed tab). However, changes in
the pull request can indirectly trigger error reports in other parts of the
codebase, including unchanged sections of the modified file or entirely
different files.

If the code scanning backend identifies "new" issues, the UI should display them
in the PR to ensure users don't overlook them.

An instance of this problem (three new issues being added, only two reported in UI): fedora-copr/vcs-diff-lint#35

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[ghostinhershell]

Thanks for sharing your feedback @praiskup! ✨