fix: allow_browser_login in import/export API

[betodealmeida]

SUMMARY

Add missing allow_browser_login to the new (introduced in #19220) import/export API, otherwise users can't interact with it.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

Log in and visit https://example.org/api/v1/assets/export/, a ZIP should be downloaded.

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 #19656 (4b067fe) into master (9554135) will decrease coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #19656      +/-   ##
==========================================
- Coverage   66.47%   66.31%   -0.17%     
==========================================
  Files        1681     1681              
  Lines       64467    64468       +1     
  Branches     6607     6607              
==========================================
- Hits        42856    42750     -106     
- Misses      19917    20024     +107     
  Partials     1694     1694              

Flag	Coverage Δ
hive	?
mysql	81.90% <100.00%> (+<0.01%)	⬆️
postgres	81.95% <100.00%> (+<0.01%)	⬆️
presto	?
python	82.05% <100.00%> (-0.34%)	⬇️
sqlite	81.72% <100.00%> (+<0.01%)	⬆️
unit	47.71% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset/importexport/api.py	100.00% <100.00%> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-85.19%)	⬇️
superset/db_engine_specs/hive.py	70.11% <0.00%> (-15.71%)	⬇️
superset/db_engine_specs/presto.py	83.64% <0.00%> (-5.39%)	⬇️
superset/connectors/sqla/models.py	88.24% <0.00%> (-1.22%)	⬇️
superset/db_engine_specs/base.py	88.01% <0.00%> (-0.34%)	⬇️
superset/models/core.py	88.83% <0.00%> (-0.24%)	⬇️
superset/utils/core.py	89.71% <0.00%> (-0.12%)	⬇️

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