fix: dashboard api cache decorator

[dpgaspar]

SUMMARY

Small refactor, @etag_cache needs to be on a different position on the decorators

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

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 #21964 (8933daf) into master (102909e) will decrease coverage by 1.31%.
The diff coverage is 100.00%.

❗ Current head 8933daf differs from pull request most recent head 130ec4b. Consider uploading reports for the commit 130ec4b to get more accurate results

@@            Coverage Diff             @@
##           master   #21964      +/-   ##
==========================================
- Coverage   66.86%   65.54%   -1.32%     
==========================================
  Files        1807     1807              
  Lines       69218    69218              
  Branches     7402     7402              
==========================================
- Hits        46280    45370     -910     
- Misses      21033    21943     +910     
  Partials     1905     1905              

Flag	Coverage Δ
mysql	78.36% <100.00%> (ø)
postgres	78.43% <100.00%> (ø)
presto	?
python	78.55% <100.00%> (-2.73%)	⬇️
sqlite	76.91% <100.00%> (ø)
unit	?

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

Impacted Files	Coverage Δ
superset/dashboards/api.py	92.52% <100.00%> (ø)
superset/tables/schemas.py	0.00% <0.00%> (-100.00%)	⬇️
superset/columns/schemas.py	0.00% <0.00%> (-100.00%)	⬇️
...set/advanced_data_type/plugins/internet_address.py	16.32% <0.00%> (-79.60%)	⬇️
superset/utils/pandas_postprocessing/boxplot.py	20.51% <0.00%> (-79.49%)	⬇️
superset/charts/post_processing.py	11.76% <0.00%> (-77.95%)	⬇️
...perset/advanced_data_type/plugins/internet_port.py	18.75% <0.00%> (-77.09%)	⬇️
superset/utils/pandas_postprocessing/rolling.py	21.87% <0.00%> (-68.75%)	⬇️
...perset/utils/pandas_postprocessing/contribution.py	34.61% <0.00%> (-65.39%)	⬇️
superset/utils/pandas_postprocessing/resample.py	37.50% <0.00%> (-62.50%)	⬇️
... and 51 more

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[villebro]

LGTM

[ktmud]

Was there anything breaking in the original code?

[dpgaspar]

Was there anything breaking in the original code?

yes it was, further details on our pmc channel