Namely promql-duration-expr and promql-extended-range-selectors. This
allows promtool to e.g. check rules files using syntax gated by these
features.
Signed-off-by: Ian Kerins <git@isk.haus>
These are supported in the main prometheus binary but the feature flags
weren't supported in promtool.
Fixes#16412.
Signed-off-by: David Leadbeater <dgl@dgl.cx>