fix: "Week Staring Monday" time grain for BigQuery

[ramunas-omnisend]

SUMMARY

Time granularity "Week Staring Monday" added for BigQuery

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

Create a chart for BigQuery. Choose "Week starting Monday". Ensure data is aggregated by week with the first day being Monday.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• [ X] 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 #20091 (5326908) into master (e69f629) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 5326908 differs from pull request most recent head d26c36f. Consider uploading reports for the commit d26c36f to get more accurate results

@@            Coverage Diff             @@
##           master   #20091      +/-   ##
==========================================
- Coverage   66.45%   66.45%   -0.01%     
==========================================
  Files        1721     1721              
  Lines       64481    64481              
  Branches     6796     6796              
==========================================
- Hits        42854    42853       -1     
- Misses      19897    19898       +1     
  Partials     1730     1730              

Flag	Coverage Δ
hive	53.69% <ø> (ø)
mysql	82.13% <ø> (ø)
postgres	82.19% <ø> (ø)
presto	53.55% <ø> (ø)
python	82.61% <ø> (-0.01%)	⬇️
sqlite	81.93% <ø> (ø)
unit	?

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/initialization/__init__.py	91.13% <0.00%> (-0.36%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e69f629...d26c36f. Read the comment docs.

[villebro]

LGTM, thanks for adding this!