fix(ingest/bigquery): quote string constants in query

[mayurinehate]

Quotes accidentally removed in this PR.

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -24.06 ⚠️

Comparison is base (a62889b) 74.89% compared to head (8df1dcf) 50.83%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #7694       +/-   ##
===========================================
- Coverage   74.89%   50.83%   -24.06%     
===========================================
  Files         353      353               
  Lines       35379    35379               
===========================================
- Hits        26497    17986     -8511     
- Misses       8882    17393     +8511     

Flag	Coverage Δ
pytest-testIntegration	50.83% <ø> (-0.01%)	⬇️
pytest-testIntegrationBatch1	?
pytest-testQuick	?
pytest-testSlowIntegration	?

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

Impacted Files	Coverage Δ
...ub/ingestion/source/bigquery_v2/bigquery_schema.py	63.08% <ø> (-3.36%)	⬇️

... and 199 files with indirect coverage changes

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