These aliases were added in 4321293972
(part of v28.0), but did not deprecate them. They are no longer used
in the CLI itself, but may be used by cli-plugin implementations.
This deprecates the aliases in `cli-plugins/manager` in favor of
their equivalent in `cli-plugins/manager/metadata`:
- `NamePrefix`
- `MetadataSubcommandName`
- `HookSubcommandName`
- `Metadata`
- `ReexecEnvvar`
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
5876b2941c