Fix dry_run bug that was making to_bigquery hang indefinitely

[codyjlin]

Signed-off-by: Cody Lin codyl@twitter.com

What this PR does / why we need it:
In PR #1661, I accidentally switched the order of the dry_run output and _block_until_done (these lines) in BigQueryRetrievalJob.to_bigquery that was making any dry_run call to hang. I fix it here.

Which issue(s) this PR fixes:

(Not large enough for issue)

Does this PR introduce a user-facing change?:

NONE

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[codyjlin]

/kind bug

[codecov-commenter]

Codecov Report

Merging #1706 (f23b4fc) into master (0d2179d) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #1706   +/-   ##
=======================================
  Coverage   82.75%   82.75%           
=======================================
  Files          76       76           
  Lines        6754     6754           
=======================================
  Hits         5589     5589           
  Misses       1165     1165           

Flag	Coverage Δ
integrationtests	82.67% <0.00%> (ø)
unittests	69.73% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdk/python/feast/infra/offline_stores/bigquery.py	76.14% <0.00%> (ø)

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[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: achals, codyjlin

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