ui: Fixes styling of 'duplicate intention' error message

[johncowen]

During #5033 tweaked the possible classes for our notifications. The where all either success or error, apart from one, which we didn't realize for when you try to save an intention that already exists.

This makes 'exists' notifications like error ones.

Previous:

Fixed:

At some point after our data-source work lands we are likely to re-visit this as less of the UI will use a Route.model blocking page load approach, so we added some comments here to that effect.

[codecov]

Codecov Report

Merging #6936 into ui-staging will decrease coverage by <.01%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           ui-staging    #6936      +/-   ##
==============================================
- Coverage       65.66%   65.65%   -0.01%     
==============================================
  Files             443      443              
  Lines           53312    53312              
==============================================
- Hits            35006    35004       -2     
- Misses          14086    14093       +7     
+ Partials         4220     4215       -5

Impacted Files	Coverage Δ
command/monitor/monitor.go	52% <0%> (-4%)	⬇️
agent/consul/operator_autopilot_endpoint.go	46% <0%> (-4%)	⬇️
agent/consul/session_ttl.go	85.48% <0%> (-3.23%)	⬇️
agent/consul/replication.go	85.71% <0%> (-2.39%)	⬇️
agent/consul/config_replication.go	75.51% <0%> (-2.05%)	⬇️
agent/consul/rpc.go	78.57% <0%> (-0.76%)	⬇️
agent/local/state.go	77.08% <0%> (-0.49%)	⬇️
agent/consul/leader.go	69.61% <0%> (-0.39%)	⬇️
agent/config/builder.go	83.21% <0%> (-0.09%)	⬇️
agent/service_manager.go	82.47% <0%> (ø)	⬆️
... and 6 more

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[ghost]

Hey there,

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