feat(prophet): enable confidence intervals and y_hat without forecast

[exemplary-citizen]

SUMMARY

Allows users to add confidence intervals and y_hat to charts with zero forecast period

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

Added tests to tests/integration_tests/pandas_postprocessing_tests.py

ADDITIONAL INFORMATION

Addresses part of #17510

• Has associated issue: [Prophet]Leverage predictive analytics to trigger alerts #17510
• 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

cc: @villebro @bkyryliuk

[codecov]

Codecov Report

Merging #17658 (00357e5) into master (2ae83fa) will decrease coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #17658      +/-   ##
==========================================
- Coverage   68.85%   68.73%   -0.12%     
==========================================
  Files        1597     1597              
  Lines       65251    65251              
  Branches     6950     6950              
==========================================
- Hits        44927    44850      -77     
- Misses      18439    18516      +77     
  Partials     1885     1885              

Flag	Coverage Δ
hive	?
mysql	82.10% <100.00%> (ø)
postgres	82.11% <100.00%> (ø)
python	82.20% <100.00%> (-0.26%)	⬇️
sqlite	81.80% <100.00%> (ø)

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

Impacted Files	Coverage Δ
superset/charts/schemas.py	99.33% <ø> (ø)
superset/utils/pandas_postprocessing.py	85.80% <100.00%> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-85.19%)	⬇️
superset/db_engine_specs/hive.py	70.27% <0.00%> (-16.99%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/db_engine_specs/presto.py	83.50% <0.00%> (-0.84%)	⬇️
superset/db_engine_specs/base.py	88.29% <0.00%> (-0.39%)	⬇️
superset/connectors/sqla/models.py	86.85% <0.00%> (-0.23%)	⬇️
superset/utils/core.py	89.64% <0.00%> (-0.12%)	⬇️

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[villebro]

Oh nice, I hadn't thought of this use case 👍 LGTM if you agree with that minor change.

[villebro]

LGTM