docs(file sink): add security warning to path template field (#24983)

The rendered path can resolve to any filesystem location. Add a
docs::warnings annotation so users are made aware when fields from
untrusted sources are used in the path template.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: pront

src/sinks/file/mod.rs

@@ -57,6 +57,9 @@ pub struct FileSinkConfig {
         docs::examples = "/tmp/application-{{ application_id }}-%Y-%m-%d.log"
     ))]
     #[configurable(metadata(docs::examples = "/tmp/vector-%Y-%m-%d.log.zst"))]
+    #[configurable(metadata(
+        docs::warnings = "The rendered path can resolve to any location on the filesystem. Vector will write to it if the process has permission."
+    ))]
     pub path: Template,
 
     /// The amount of time that a file can be idle and stay open.

website/cue/reference/components/sinks/generated/file.cue

@@ -590,6 +590,7 @@ generated: components: sinks: file: configuration: {
 			examples: ["/tmp/vector-%Y-%m-%d.log", "/tmp/application-{{ application_id }}-%Y-%m-%d.log", "/tmp/vector-%Y-%m-%d.log.zst"]
 			syntax: "template"
 		}
+		warnings: ["The rendered path can resolve to any location on the filesystem. Vector will write to it if the process has permission."]
 	}
 	timezone: {
 		description: """