[Console] Adding a deprecation note about DialogHelper
minor #12737 [Console] Adding a deprecation note about DialogHelper (rodrigobb)

This PR was squashed before being merged into the 2.7 branch (closes #12737).

Discussion
----------

[Console] Adding a deprecation note about DialogHelper

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | #12704
| License       | MIT
| Doc PR        | -

Commits
-------

673c253 [Console] Adding a deprecation note about DialogHelper