Add support to make phase always run

[PrasadG193]

Is your feature request related to a problem? Please describe.

Consider we have a BP where we are trying to perform backup in multiple phases. And we have last phase (say cleanup phase) which cleans up temporary artifacts that are created as a part of backup. Even If any of the phase fails, the cleanup phase should get called. So there should be a way to mark cleanup phase run always.

Describe the solution you'd like
We can add a field to phase spec (e.g alwaysRun=true/false) to toggle the behaviour

[vkamra]

@PrasadG193 - this would be useful - a section in the phase where we would specify this and perhaps other execution controls such as phase timeouts, retries would be a good place to put this. I know @tdmanv has discussed this.

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[ihcsim]

Fixed by #1297.