feat: add v1 integration tests

[mmladenovski]

This change adds integration tests for the BigQuery Storage v1 API.

The tests are identical to the ones from v1beta2.

• First commit copies the v1beta2 integration tests as-is, without any modifications.
  • This commit makes it easier to review the second commit
• Second commit updates the version of the integration tests.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@43fc284). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #68   +/-   ##
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  Coverage          ?   70.81%           
  Complexity        ?      265           
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  Files             ?       39           
  Lines             ?     1809           
  Branches          ?        4           
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  Hits              ?     1281           
  Misses            ?      524           
  Partials          ?        4

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