fix: congestion_config within common config and AWS S3 support

[tonychoe]

What this PR does / why we need it: Current code does not support (1) when congestion_control is part “common” config section (2) AWS S3 storage to use congestion_control config

Which issue(s) this PR fixes: Fixes https://github.com/grafana/loki/issues/13100

Special notes for your reviewer:

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.
• [x] Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
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