Pipeline alias interaction is not ideal

[tkyi]

What happened: It's not clear how to interact with pipeline alias section. Also, when trying to set pipeline alias, I don't get any sort of feedback that a request was sent or the action was successful.

What you expected to happen: I should see an alert telling me my action was successful. Or a modal pop up like when trying to disable/enable a job.

Alert example(https://github.com/screwdriver-cd/ui/blob/master/app/components/token-list/template.hbs#L4-L10):

Modal example:

How to reproduce it: Go to pipeline Options tab. Under Pipeline Preferences section, type an alias into the field for Rename pipeline. Hit enter.

[tkyi]

After changes:

Some additional feedback:

• Expect different color when hovering over Submit button
• Expect after clicking Submit, a loading icon showed up (see what happens after you click Update on the same page)
• Would be nice if the alert said something like "Pipeline alias name {{alias}} updated successfully"