[Eventgrid] Remove deprecated parameter `--identity` in time

[evelyn-ys]

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

Deprecation needs to be removed in time, or else CLI release will break.

Describe the solution you'd like

--identity is marked as deprecated in version 2.46.0 in #21648. Please remove the param in time to avoid CLI release failure like #20682 (comment)

[jiasli]

It's better to synchronize with breaking change windows - 2.37.0, 2.43.0, or 2.39.0. See #21952

[navba-MSFT]

Removing CXP Attention label since this was opened for the product improvement as internal issue and not customer reported.

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @jfggdl.

Issue Details

---

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

Deprecation needs to be removed in time, or else CLI release will break.

Describe the solution you'd like

--identity is marked as deprecated in version 2.46.0 in #21648. Please remove the param in time to avoid CLI release failure like #20682 (comment)

Author:	evelyn-ys
Assignees:	rohkuma-microsoft
Labels:	Service Attention, Event Grid, Auto-Assign
Milestone:	May 2022 (2022-05-24) - For Build