[GBQ] connection is not reacquired after table truncation

[Licenser]

Problem

When truncating a table while streaming to it, the connection is not re-aquired so no further writes can be done

Steps

1. write to gbq table
2. truncate table while writing
3. error logs without end

Possible Solution(s)
reconnect on trucation errors

Notes

Output of tremor --version: tremor 0.13.0-rc.14