[202012][Arista] Ignore poll errors during get_event_change (#16274)

#### Why I did it

When an exception happens during `get_change_event` it brings the process invoking it down.

##### Work item tracking
- Microsoft ADO **(number only)**: 24599154

#### How I did it

This is a backport of #16112
Handle exceptions gracefully within `get_change_event`

#### Description for the changelog

Ignore poll errors during get_event_change on Arista devices
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Samuel Angebault 2023-08-28 18:44:47 +02:00 committed by GitHub
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