support scraping metadata from Kubernetes log files on Windows

This implements the changes from #19799, including the suggested fix for
the failing test. I've been running the change with the path separator
successfully for 5 months now.

src/sources/kubernetes_logs/path_helpers.rs

@@ -34,7 +34,7 @@ pub(super) fn build_pod_logs_directory(
 ///
 /// Inspired by <https://github.com/kubernetes/kubernetes/blob/31305966789525fca49ec26c289e565467d1f1c4/pkg/kubelet/kuberuntime/helpers.go#L186>
 pub(super) fn parse_log_file_path(path: &str) -> Option<LogFileInfo<'_>> {
-    let mut components = path.rsplit('/');
+    let mut components = path.rsplit(std::path::MAIN_SEPARATOR);
 
     let _log_file_name = components.next()?;
     let container_name = components.next()?;

src/sources/kubernetes_logs/pod_metadata_annotator.rs

@@ -752,9 +752,10 @@ mod tests {
 
     #[test]
     fn test_annotate_from_file_info() {
+        let path = ["var", "log", "pods", "sandbox0-ns_sandbox0-name_sandbox0-uid", "sandbox0-container0-name", "1.log"].iter().collect::<PathBuf>();
         let cases = vec![(
             FieldsSpec::default(),
-            "/var/log/pods/sandbox0-ns_sandbox0-name_sandbox0-uid/sandbox0-container0-name/1.log",
+            path,
             {
                 let mut log = LogEvent::default();
                 log.insert(event_path!("kubernetes", "container_name"), "sandbox0-container0-name");
@@ -766,7 +767,7 @@ mod tests {
                 container_name: OwnedTargetPath::event(owned_value_path!("container_name")).into(),
                 ..Default::default()
             },
-            "/var/log/pods/sandbox0-ns_sandbox0-name_sandbox0-uid/sandbox0-container0-name/1.log",
+            path,
             {
                 let mut log = LogEvent::default();
                 log.insert(event_path!("container_name"), "sandbox0-container0-name");