chore: Clean up unused bloom filter related code

[chaudum]

What this PR does / why we need it:

This PR tries to eliminate dead code in the bloom package, mainly related to line tokenization.

Special notes for your reviewer:

The binary encoding of the Schema object has been kept "backwards" compatible. Should we drop that?

Checklist

• [x] Reviewed the CONTRIBUTING.md guide (required)
• [x] Documentation added
• [x] Tests updated
• [x] Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• [ ] Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• [ ] For Helm chart changes bump the Helm chart version in production/helm/loki/Chart.yaml and update production/helm/loki/CHANGELOG.md and production/helm/loki/README.md. Example PR
• [ ] If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

[rfratto]

The binary encoding of the Schema object has been kept "backwards" compatible. Should we drop that?

This would only impact our existing deployment, right? It's very little overhead so I don't think it matters, but it might be nice to remove it now while we have a chance as long as it wouldn't cause too much pain.

[chaudum]

The binary encoding of the Schema object has been kept "backwards" compatible. Should we drop that?

This would only impact our existing deployment, right?

Right.

It's very little overhead so I don't think it matters, but it might be nice to remove it now while we have a chance as long as it wouldn't cause too much pain.

Ok, let's remove it. It means that existing V3 blocks cannot be read any more and should be deleted from object storage.