fix(core): Don't swallow connection errors when fetching credentials #16181
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Summary
We have had multiple reports of executions failing, because the credential could not be found:

Credential with ID "305" does not exist for type "googleBigQueryOAuth2Api".
Sometimes these have been false positives, because the error thrown by TypeORM was actually a connection error that we just ignore.
This PR first checks if the error thrown is an
EntityNotFoundError
before replacing it with aCredentialNotFoundError
.If it's any other error it will be re-thrown so that user reports contain the correct error when they report this. (most of the time it's this, but we can't be sure because we're hiding it).
Related Linear tickets, Github issues, and Community forum posts
https://n8nio.slack.com/archives/C035KBDA917/p1748612791750639
Review / Merge checklist
Docs updated or follow-up ticket created.PR Labeled withrelease/backport
(if the PR is an urgent fix that needs to be backported)