fix: Redirects old Explore URLs to the new ones

[michael-s-molina]

SUMMARY

To preserve bookmarked URLs this PR redirects old Explore URLs in the format /superset/explore to the new one without the /superset prefix. This only affects GET operations. We only preserved the POST operation in case anyone is using it for something. In any case, this endpoint will be deleted in 3.0 as the warning clearly states.

Follow-up of #20572

TESTING INSTRUCTIONS

Check if old Explore URLs are redirected to the new ones with all parameters preserved.

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 #20812 (db7175e) into master (922b4b8) will decrease coverage by 0.17%.
The diff coverage is 50.00%.

❗ Current head db7175e differs from pull request most recent head 714286c. Consider uploading reports for the commit 714286c to get more accurate results

@@            Coverage Diff             @@
##           master   #20812      +/-   ##
==========================================
- Coverage   66.29%   66.12%   -0.18%     
==========================================
  Files        1758     1758              
  Lines       66801    66803       +2     
  Branches     7055     7055              
==========================================
- Hits        44288    44173     -115     
- Misses      20713    20830     +117     
  Partials     1800     1800              

Flag	Coverage Δ
hive	?
mysql	80.98% <50.00%> (-0.01%)	⬇️
postgres	81.04% <50.00%> (-0.02%)	⬇️
presto	?
python	81.14% <50.00%> (-0.36%)	⬇️
sqlite	79.54% <50.00%> (-0.01%)	⬇️
unit	?

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

Impacted Files	Coverage Δ
superset/views/core.py	75.64% <50.00%> (-0.04%)	⬇️
superset/db_engines/hive.py	0.00% <0.00%> (-85.19%)	⬇️
superset/db_engine_specs/hive.py	70.22% <0.00%> (-15.65%)	⬇️
superset/db_engine_specs/presto.py	83.64% <0.00%> (-5.39%)	⬇️
superset/reports/commands/log_prune.py	85.71% <0.00%> (-3.58%)	⬇️
superset/initialization/__init__.py	89.93% <0.00%> (-1.74%)	⬇️
superset/commands/importers/v1/utils.py	92.20% <0.00%> (-1.30%)	⬇️
superset/connectors/sqla/models.py	89.20% <0.00%> (-1.15%)	⬇️
superset/common/query_object.py	93.87% <0.00%> (-0.52%)	⬇️
superset/reports/commands/execute.py	91.24% <0.00%> (-0.37%)	⬇️
... and 3 more

Help us with your feedback. Take ten seconds to tell us how you rate us.

[rusackas]

LGTM! Thank you!

[sadpandajoe]

🏷️ preset:2022.29