chore: enable BQ tests

[betodealmeida]

SUMMARY

In #16822 I added a couple unit tests for BigQuery that would only run if the optional dependencies were installed, as well as some "generic" tests based on SQLite for when the dependencies were not found.

In this PR I added the BigQuery dependencies to our test dependencies, so that the tests run on CI. I also removed the generic SQLite tests, since they're no longer needed.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

Run unit tests.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #17017 (4cfc3ba) into master (5f73ca8) will increase coverage by 0.08%.
The diff coverage is n/a.

❗ Current head 4cfc3ba differs from pull request most recent head 442155b. Consider uploading reports for the commit 442155b to get more accurate results

@@            Coverage Diff             @@
##           master   #17017      +/-   ##
==========================================
+ Coverage   76.93%   77.02%   +0.08%     
==========================================
  Files        1030     1030              
  Lines       55085    55801     +716     
  Branches     7477     7477              
==========================================
+ Hits        42382    42980     +598     
- Misses      12452    12570     +118     
  Partials      251      251              

Flag	Coverage Δ
hive	81.44% <ø> (-0.03%)	⬇️
javascript	70.89% <ø> (ø)
mysql	81.90% <ø> (-0.03%)	⬇️
postgres	82.12% <ø> (+0.18%)	⬆️
presto	?
python	82.46% <ø> (+0.02%)	⬆️
sqlite	81.58% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
superset/db_engine_specs/presto.py	84.30% <0.00%> (-6.07%)	⬇️
superset/db_engine_specs/bigquery.py	81.70% <0.00%> (-4.27%)	⬇️
superset/connectors/sqla/models.py	85.83% <0.00%> (-1.42%)	⬇️
superset/models/core.py	89.26% <0.00%> (-0.74%)	⬇️
superset/views/database/views.py	89.34% <0.00%> (+0.93%)	⬆️
superset/db_engine_specs/gsheets.py	77.47% <0.00%> (+2.47%)	⬆️
superset/views/core.py	79.60% <0.00%> (+2.69%)	⬆️
superset/connectors/base/models.py	91.86% <0.00%> (+3.72%)	⬆️

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[villebro]

LGTM. As we add more comprehensive tests to other engine specs, we might later want to break out a separate set of testing requirements and even a separate test suite if the dependency list becomes huge.