Add `--wait` and `--no-wait` for all delete operation

[rhuss]

In what area(s)?

Describe the feature:

In order to avoid race conditions when on delete an object and immediately recreate it, by default we should also wait for the end of a delete operation, like we do for service create and service update.

Therefor a --wait and a --no-wait option should be added to all "delete" operation. This can reuse our general wait handling util libs.

[rhuss]

/assign dsimansk

[rhuss]

See knative/serving#6876 for some example where this option is useful.

I think also that --wait should be the default.

[dsimansk]

PR #682 extends current wait functionality to allow waiting for various events.

To complete this issue synchronous delete op should be used for:

• service delete
• revision delete.

[dsimansk]

/reopen

To do: sync revision delete.

[knative-prow-robot]

@dsimansk: Reopened this issue.

Details

In response to this:

/reopen

To do: sync revision delete.

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