fix(viz): BigQuery time grain 'minute'/'second' throws an error

[diegomedina248]

SUMMARY

The time grain for minute and second is throwing an error.
For BigQuery, the DATE_TRUNC function does not support MINUTE and SECOND as param.
This PR changes the calculation to support these time grain options.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Error:

TESTING INSTRUCTIONS

1. Create a Time-series table
2. Mark a DATE column as temporal
3. Select that column as the time column
4. Set the time grain to Minute or Second

Ensure the query executes as expected.

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 #20350 (2c2c447) into master (c842c9e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #20350   +/-   ##
=======================================
  Coverage   66.67%   66.67%           
=======================================
  Files        1738     1738           
  Lines       65071    65071           
  Branches     6884     6884           
=======================================
  Hits        43387    43387           
  Misses      19937    19937           
  Partials     1747     1747           

Flag	Coverage Δ
hive	53.71% <ø> (ø)
mysql	82.29% <ø> (ø)
postgres	82.36% <ø> (ø)
presto	53.57% <ø> (ø)
python	82.78% <ø> (ø)
sqlite	82.09% <ø> (ø)
unit	50.16% <ø> (ø)

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

Impacted Files	Coverage Δ
superset/db_engine_specs/bigquery.py	84.84% <ø> (ø)
superset/datasets/api.py	88.52% <0.00%> (ø)

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[michael-s-molina]

LGTM