Fix the error when installing loki in aarch64 by deleting enabled block

[sunwupark]

What this PR does / why we need it:
There is an error when installing Loki as mentioned in the official documentation using apt.
After following the installation steps, the Loki service fails to start.
by deleting enabled block in metric_aggregation i could have fixed the error

Which issue(s) this PR fixes:
Fixes #15421

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

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