Delete open-telemetry/operator-ta-maintainers team

[trask]

Noticed this when reviewing #3327 (comment).

Follow-up to

• Should we get rid of the operator-ta-maintainers? opentelemetry-operator#3344
• Remove TA maintainers code ownership opentelemetry-operator#3386

@open-telemetry/operator-maintainers can you confirm and send a PR to delete it: https://github.com/open-telemetry/admin/blob/60157815f63c9cbc909244683ce282a991273c1d/teams.tf#L771-L776 (I can approve and merge it). thanks!

[pavolloffay]

+1

[pavolloffay]

https://github.com/open-telemetry/admin/pull/596