router: switch to use new QueryParametersMulti type (#29385)

Signed-off-by: Neal Turett <neal.turett@datadoghq.com>

Mirrored from https://github.com/envoyproxy/envoy @ cfdc99a00d43c6c08c22229c7053410446e51a3a

envoy/config/route/v3/route_components.proto

@@ -619,7 +619,8 @@ message RouteMatch {
   // match. The router will check the query string from the ``path`` header
   // against all the specified query parameters. If the number of specified
   // query parameters is nonzero, they all must match the ``path`` header's
-  // query string for a match to occur.
+  // query string for a match to occur.  In the event query parameters are
+  // repeated, only the first value for each key will be considered.
   //
   // .. note::
   //