Added SUI notifications product feature

[chalettu]

@miq-bot add_label enhancement
@miq-bot add_label fine/no

[chalettu]

@chriskacerguis here is the PR that is needed to fulfill ManageIQ/manageiq-ui-service#1053

[miq-bot]

Checked commit chalettu@0f1d6fb with ruby 2.2.6, rubocop 0.47.1, and haml-lint 0.20.0
0 files checked, 0 offenses detected
Everything looks fine. ⭐

[Fryguy]

Is there really a feature to get notifications? I mean, why would an admin ever turn that off? 🤔

[chriskacerguis]

@Fryguy it's for testing. QE requested to have the feature turned off. They stated that this was something that already exists in Classic UI.

[Fryguy]

That seems like a strange reason to create a whole customer-facing "product feature"

[chriskacerguis]

@Fryguy /shrug. We did that to match what is in Classic UI (again, per QE)

[Fryguy]

I'll merge for now for consistency with classic UI and for prior parity, but for the record I am 👎 on this feature in general cause it makes no sense from a customer-facing POV...just one more thing the user has to ignore to make it difficult for them.