[FR] option to remove standing feedbacks

[3dg1luk43]

Before You Submit

• I have searched the existing issues and this feature has not already been requested.
• This request is specifically about WashData, not Home Assistant core or a third-party integration.

Problem or Motivation

Button to batch flush all standing feedbacks

Proposed Solution

Same as above

Related Device Type

General / Not device-specific

Device Brand & Model (if device-specific)

No response

Alternatives Considered

No response

Additional Context

No response