CiviGrant - Fix upgrade to work on multiple domains

[colemanw]

Overview

Ensures CiviGrant component is completely removed by the upgrader.

Before

In certain conditions, such as multi-domain, CiviGrant setting was not completely removed by the upgrader step. This is pretty harmless except it was causing problems with #26036.

After

Component enable/disable functions cleaned up. Upgrader fixed.

Technical Details

The CRM_Core_BAO_ConfigSetting::disableComponent() wasn't working as expected by the upgrader because

1. It's not multi-domain aware
2. It was short-circuiting on non-existent components, and CiviGrant no longer exists as a component.
3. Domain settings for components have been consolidated by Make enable_components a non-domain setting #26043

[civibot]

(Standard links)

• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).

[eileenmcnaughton]

It would be good to fully remove that config property (well nosily deprecate I expect)

[seamuslee001]

@eileenmcnaughton the only thing I wonder is if its needed in a pre boot situation at all

[colemanw]

@seamuslee001 I don't think that's an issue because $config->__get() is just a magic function that calls settings()->get. Here's #26121