relay: Remove unused conn->ext_or_conn_id

David Gouletrequested to merge
dgoulet/tor:ticket40648_048_01 into main

This also incidently removes a use of uninitialized stack data from the connection_or_set_ext_or_identifier() function.

Fixes #40648 (closed)

Signed-off-by: David Goulet dgoulet@torproject.org

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