Update X of Y notification step labeling to calculate total steps based on enabled features

[atc0005]

As of this writing this only applies to Teams notifications, but it's worth thinking about in a larger scope.

Snippet from a switch statement responsible for setting a message card Title field:

case events.ActionSuccessDisableRequestReceived, events.ActionFailureDisableRequestReceived:
	msgCardTitle = msgCardTitlePrefix + "[step 1 of 3] " + record.Action

case events.ActionSuccessDisabledUsername, events.ActionFailureDisabledUsername:
	msgCardTitle = msgCardTitlePrefix + "[step 2 of 3] " + record.Action

case events.ActionSuccessDuplicatedUsername, events.ActionFailureDuplicatedUsername:
	msgCardTitle = msgCardTitlePrefix + "[step 2 of 3] " + record.Action

case events.ActionSuccessIgnoredUsername, events.ActionFailureIgnoredUsername:
	msgCardTitle = msgCardTitlePrefix + "[step 2 of 3] " + record.Action

case events.ActionSuccessIgnoredIPAddress, events.ActionFailureIgnoredIPAddress:
	msgCardTitle = msgCardTitlePrefix + "[step 2 of 3] " + record.Action

case events.ActionSuccessTerminatedUserSession, events.ActionFailureTerminatedUserSession:
	msgCardTitle = msgCardTitlePrefix + "[step 3 of 3] " + record.Action

Ideally the of 3 bit wouldn't be static and would be determined solely by the list of enabled features. As of this issue, this mostly pertains to sessions termination support which can be either enabled or disabled. Additionally, this section is never reached if the reported username (or associated IP Address) is in an "ignored" file (and that file is referenced by the config settings).