Logql DFS visitor does not visit subrees of label_replace

[shivanthzen]

Describe the bug
Logql DFS visitor does not visit subrees of label_replace expression .
For example, running DFS visitor for the expression,

label_replace(
			sum by (job) (
				sum_over_time(
					{namespace="tns"} |= "level=error" | json | avg=5 and bar<25ms | unwrap duration(latency)  | __error__!~".*" [5m]
				)
			/
				count_over_time({namespace="tns"} | logfmt | label_format foo=bar[5m])
			),
			"foo",
			"$1",
			"service",
			"(.*):.*"
		)

the traversal stops at label_replace.

To Reproduce

Expected behavior
The DFS Parser should visit sub expressions of label_replace without using custom VistiLabelReplaceExpr function

Environment:
go 1.24.1, loki 3.4.2

Screenshots, Promtail config, or terminal output
None