[helm] Adding podDisruptionBudget values and templating to loki chart

[rgarcia6520]

What this PR does / why we need it:

Which issue(s) this PR fixes: Fixes #8588

Special notes for your reviewer:

Checklist

• [x] 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