Promtail: Break on iterate journal failure

[farodin91]

What this PR does / why we need it:

{"caller":"journaltarget.go:214","err":"failed to iterate journal: bad message","level":"error","msg":"received unexpected error while following the journal","ts":"2023-04-17T12:24:26.803335195Z"}
{"caller":"journaltarget.go:214","err":"failed to iterate journal: bad message","level":"error","msg":"received unexpected error while following the journal","ts":"2023-04-17T12:24:26.903980219Z"}
{"caller":"journaltarget.go:214","err":"failed to iterate journal: bad message","level":"error","msg":"received unexpected error while following the journal","ts":"2023-04-17T12:24:27.0042025Z"}

https://github.com/coreos/go-systemd/blob/main/sdjournal/journal.go#L583 origin

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• CHANGELOG.md updated
• Changes that require user attention or interaction to upgrade are documented in docs/sources/upgrading/_index.md

[farodin91]

@dannykopping Would you like to review? I have no idea why drone is failing

[dannykopping]

Thank you! Can you please add a test?

[dannykopping]

@farodin91 on second thought, we don't need a test here. Thank you

[farodin91]

@dannykopping Will this be backported?

[dannykopping]

Sure 👍

[grafanabot]

The backport to release-2.8.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new branch
git switch --create backport-9155-to-release-2.8.x origin/release-2.8.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x c4048a3adffc4b13957d0b3f41381277b391c56f
# Push it to GitHub
git push --set-upstream origin backport-9155-to-release-2.8.x
git switch main
# Remove the local backport branch
git branch -D backport-9155-to-release-2.8.x

Then, create a pull request where the base branch is release-2.8.x and the compare/head branch is backport-9155-to-release-2.8.x.

[dannykopping]

@farodin91 done: #9403