feat: add lines skipped metric to pattern ingesters

[trevorwhitney]

What this PR does / why we need it:

This adds a lines_skpped metric to the pattern ingesters, which counts log lines that have been skipped for pattern ingestion. This also adds logic to skip lines with too many (> 50) tokens.

Reasons for skipping:

• too few tokens
• too many tokens
• line too long

Which issue(s) this PR fixes:
Fixes #14882

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• 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
• 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