fix: Revert "feat: Assert for bad max_query_lookback config (#16362)"

[DylanGuedes]

This reverts commit 073c94c.

What this PR does / why we need it:
I'm reverting this check because the way it evaluates tenants can cause concurrent problems when generating the jsonnet manifests. For now I'm reverting to unblock future weekly releases and I'll look into a better way of implementing this check.

Which issue(s) this PR fixes:
Fixes #

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