Include missing RBAC roles

[thesuperzapper]

This is a simple fix which includes the missing RBAC roles.

• can_failed RBAC permission for the User role
  • this omission was clearly a mistake as the set_failed RBAC permission is already present in the User role
• can_last_dagruns RBAC permission for the Viewer role
  • this lets allows viewing the "Last Run" for each dag on the airflow main web page
  • this is mentioned in 'Last Run' column empty for Viewer role in RBAC UI #8526

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[thesuperzapper]

@potiuk can you review this?

[ashb]

@thesuperzapper Tests need updating.

[ashb]

This doesn't seem like the right fix. If it's saying "redirecting" but not issuing a 302 something else needs changing here.

[thesuperzapper]

@ashb That test has been broken since it was created (mostly because can_failure was missing).

You're probably right, about 'Redirecting' what content does that POST return?

What text should we check for, other tests in that file check for example_bash_operator in the response, should this do the same?

[thesuperzapper]

@ashb, I have made the change requested, is this PR now acceptable?