fix: remove deprecated ETagResponseMixin

[eschutho]

SUMMARY

The Werkzeug 2.1 release removed some deprecated code and merged the ETagResponseMixin into the Response class. Instead of pinning superset to any flask or werkzeug version, I'm returning the Response object here instead of the mixin so that we can continue to support later versions. This seems to be an issue commonly found in Ubuntu systems.

ADDITIONAL INFORMATION

• Has associated issue: Fixes ModuleNotFoundError: No module named 'werkzeug.wrappers.etag' #20723
• 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 #21773 (bf20b3f) into master (bd3166b) will decrease coverage by 11.37%.
The diff coverage is 100.00%.

❗ Current head bf20b3f differs from pull request most recent head ef1f60d. Consider uploading reports for the commit ef1f60d to get more accurate results

@@             Coverage Diff             @@
##           master   #21773       +/-   ##
===========================================
- Coverage   66.88%   55.50%   -11.38%     
===========================================
  Files        1802     1802               
  Lines       68987    68987               
  Branches     7345     7345               
===========================================
- Hits        46139    38291     -7848     
- Misses      20951    28799     +7848     
  Partials     1897     1897               

Flag	Coverage Δ
hive	52.93% <100.00%> (ø)
mysql	?
postgres	?
presto	52.83% <100.00%> (ø)
python	57.93% <100.00%> (-23.53%)	⬇️
sqlite	?
unit	51.05% <100.00%> (ø)

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

Impacted Files	Coverage Δ
superset/utils/cache.py	54.46% <100.00%> (-20.54%)	⬇️
superset/utils/dashboard_import_export.py	0.00% <0.00%> (-100.00%)	⬇️
superset/tags/core.py	4.54% <0.00%> (-95.46%)	⬇️
superset/key_value/commands/update.py	0.00% <0.00%> (-90.91%)	⬇️
superset/key_value/commands/delete.py	0.00% <0.00%> (-87.88%)	⬇️
superset/key_value/commands/delete_expired.py	0.00% <0.00%> (-84.00%)	⬇️
superset/dashboards/commands/importers/v0.py	15.62% <0.00%> (-76.25%)	⬇️
superset/datasets/commands/update.py	25.00% <0.00%> (-69.05%)	⬇️
superset/datasets/commands/importers/v0.py	24.03% <0.00%> (-69.00%)	⬇️
superset/datasets/commands/create.py	31.25% <0.00%> (-68.75%)	⬇️
... and 284 more

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[zhaoyongjie]

Thanks for the fixing, LGTM.