Fix insert_job method of BigQueryHook

[turbaszek]

The method should submit the job and wait for the result.
Closes: #9897

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[nathadfield]

@turbaszek Ah! You beat me to the fix!

[potiuk]

So looks like indeed new backport package release is around the corner.

[turbaszek]

I run system tests using changes from #9909 and everything seems to work as expected

[turbaszek]

FYI @olchas

[nathadfield]

So looks like indeed new backport package release is around the corner.

Definitely! Especially because of this too.

#9900