chore: Print trace ID in panic when available.

[jeschkies]

What this PR does / why we need it:
Debugging a panic log is simplified if the trace ID is printed as well.

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

[jeschkies]

I'd change it to

Suggested change

	fmt.Fprintf(os.Stderr, "panic: %v %s\n%s", p, traceID, stack)
	fmt.Fprintf(os.Stderr, "panic=%v %s\n%s", p, traceID, stack)

but am afraid that this would break some alerts.

[periklis]

You good do also:

fmt.Fprintf(os.Stderr, `panic:"Look into panic=" panic=%v %s\n%s`, p, traceID, stack)