migration_status: Update ANSI code clean up regex.

in `get_migrations_status`, we clean up the printed output of any ANSI
codes used to format the output. Currently the regex only cleans up bold
ANSI escape code (\x1b[1m) and style reset code (\x1b[0m). So it won't
be able to clean up basic ANSI escape codes such as "\x1b\31;1m" which
is used to format `showmigrations` output for apps with no migrations.
   e.g, "\x1b\31;1m (no migrations)"

This commit updates the regex to catch a wider range of basic ANSI
codes.

zerver/lib/migration_status.py

@@ -37,4 +37,4 @@ def get_migration_status(**options: Any) -> str:
     )
     out.seek(0)
     output = out.read()
-    return re.sub(r"\x1b\[(1|0)m", "", output)
+    return re.sub(r"\x1b\[[0-9;]*m", "", output)