Fix notify_only_default_branch check for Slack service
What does this MR do?
Fixes the notify_only_default_branch conditional check
Are there points in the code the reviewer needs to double check?
Specs
Why was this MR needed?
The notify_only_default_branch property is using boolean_accessor this means we need to check it using a question methods. Also add specs for disabling this option.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together