Use URLPathEscapeAll instead of URLPathEscape for path encoding.
URLPathEscape relies on Go's url.URL.String() which only minimally
escapes paths - reserved sub-delimiter characters like semicolons and
equals signs pass through unescaped. Per RFC 3986 section 3.3, these
characters must be percent-encoded when used as literal values in
path segments.
Some WebDAV servers (notably dCache/Jetty) interpret unescaped
semicolons as path parameter delimiters, which truncates filenames
at the semicolon position. URLPathEscapeAll encodes everything
except [A-Za-z0-9/], which is safe for all servers.
Fixes#9082