[chore] Fix flaky test in filelog receiver (open-telemetry#35012)

Quick fix for
open-telemetry#35007.

Ideally we should not need to depend on order of files returned from the
finder but there are apparently some subtle implications which need to
be better understood before we remove the assumption.

pkg/stanza/fileconsumer/matcher/internal/finder/finder.go

@@ -6,6 +6,7 @@ package finder // import "github.com/open-telemetry/opentelemetry-collector-cont
 import (
 	"errors"
 	"fmt"
+	"slices"
 
 	"github.com/bmatcuk/doublestar/v4"
 	"golang.org/x/exp/maps"
@@ -46,5 +47,7 @@ func FindFiles(includes []string, excludes []string) ([]string, error) {
 		}
 	}
 
-	return maps.Keys(allSet), errs
+	keys := maps.Keys(allSet)
+	slices.Sort(keys)
+	return keys, errs
 }