Add a hint about disabling model verification errors

Summary:
I imagine some open source users give up after seeing model verification errors.
We should recommend using `--no-verify` in those cases.
For instance, I'm trying Pysa on Zulip and some of our django models seem to error (maybe some are outdated?).
Using `--no-verify` allows to continue the analysis and ignore those.

Reviewed By: tianhan0

Differential Revision: D77726788

fbshipit-source-id: 7873fbf76ce7a1f3b02a527f4e2ee8ac50ca6843

Author: arthaud

client/commands/analyze.py

@@ -438,6 +438,7 @@ def _run_analyze_command(
                     output=output,
                     error_kind="model verification",
                 )
+                LOG.warning("Hint: use --no-verify to silence these errors")
                 return commands.ExitCode.MODEL_VERIFICATION_ERROR
             else:
                 LOG.error(f"Pyre exited with non-zero return code: {return_code}.")