fix(pageserver): handle version number in draw timeline (#8102)

We now have a `vX` number in the file name, i.e.,
`000000067F0000000400000B150100000000-000000067F0000000400000D350100000000__00000000014B7AC8-v1-00000001`

The related pull request for new-style path was merged a month ago
#7660

## Summary of changes

Fixed the draw timeline dir command to handle it.

---------

Signed-off-by: Alex Chi Z <chi@neon.tech>

pageserver/ctl/src/draw_timeline_dir.rs

@@ -83,10 +83,18 @@ fn parse_filename(name: &str) -> (Range<Key>, Range<Lsn>) {
     let keys: Vec<&str> = split[0].split('-').collect();
     let mut lsns: Vec<&str> = split[1].split('-').collect();
 
+    // The current format of the layer file name: 000000067F0000000400000B150100000000-000000067F0000000400000D350100000000__00000000014B7AC8-v1-00000001
+
+    // Handle generation number `-00000001` part
     if lsns.last().expect("should").len() == 8 {
         lsns.pop();
     }
 
+    // Handle version number `-v1` part
+    if lsns.last().expect("should").starts_with('v') {
+        lsns.pop();
+    }
+
     if lsns.len() == 1 {
         lsns.push(lsns[0]);
     }