sysupdate: Change feature/component enablement and disablement (#43191)

- sysupdate: In the auto-enable service, don't enable all features

    The auto-enable service should activate suggested components and
features but enabled all features which includes the default components
    unsuggested features and any unsuggested features of the suggested
components. This is unexpected behavior and we rather want this service
    to be limited to suggested features.
Switch the service flag to suggested and make the wording more explicit
    in the man page. Also fix the wrong statement that it operates on
    enabled components, it operates on all components, also explicitly
    disabled ones.

- sysupdate: Change disabling with
--component-suggested/--feature-suggested

    The disabling of features or components with the flag
--component-suggested/--feature-suggested didn't disable the suggested
ones but instead disabled all other ones. This is rather unintuitive due
    to how the flags are named and also not really needed because the
intended reconciliation outcome can instead be done by first disabling
everything and then enabling the suggested ones again which is easier to
    reason about. For components the tricky part is that they default to
enabled and thus it's better to have the disable/enable commands with
--component-suggested operate only on suggested ones instead of touching
others like "legacy" components that don't explicity say whether they
    are enabled and suggested or not.

    Make running disablement of components/features with
    --component-suggested/--feature-suggested undo a previous enablement
with the same flags. Document how one can align the system to only use
suggested components/features and not anything else by doing it in two
steps, first disabling everything and then enabling suggested ones. This
also makes it clearer now that all components that are not explicitly
    enabled nor suggested will be disabled then.