Fix new pylint errors in main

[jonathan-greig]

• Added # pylint: disable=no-member on no-member errors (GCP libs dynamically add attributes so can't be statically checked)
• Fixed occurrences of consider-using-dict-items

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@9a0a583). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #441   +/-   ##
=======================================
  Coverage        ?   59.08%           
=======================================
  Files           ?       49           
  Lines           ?     4025           
  Branches        ?        0           
=======================================
  Hits            ?     2378           
  Misses          ?     1647           
  Partials        ?        0           

Flag	Coverage Δ
nosetests	59.08% <0.00%> (?)

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