Added ability to override settings via config

[cmraible]

ref https://linear.app/ghost/issue/ENG-1974/create-config-option-to-forcibly-disable-email-track-clicks

• We want to be able to disable the email_track_clicks setting forcibly via config, such that it is turned off and the user is unable to change it in the UI.
• This commit passes a settingsOverrides object into the settings cache, which is passed in from the hostSettings:settingsOverride configuration key, and overrides both settingsCache.get() and settingsCache.getAll() to override the value of the setting that's returned with whatever is defined via configuration.

[coderabbitai]

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[cmraible]

High level approach here is to override the settingsCache.get() and settingsCache.getAll() methods to use the value from config, rather than from the database. Rather than building in a specific exception email_track_clicks, this is a generalizable pattern that can be used to override any setting.

Only the value of the setting can be overridden, and if it is overridden, it will add an override: true key to the returned setting. This will be used on the frontend to disable the control from being modified.