[Console] [Hackday] [2.7]  Add a deprecation note about ProgressHelper

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | #12706
| License       | MIT
| Doc PR        | 
I would have said: 'The "ProgressHelper" class is ...'