Restore pull_request_target trigger for e2e tests

[robdiciuccio]

SUMMARY

Restores pull_request_target trigger for e2e tests, recently changed in #12241

NOTE: this will require a second PR to remove the pull_request action once this PR is merged.

TEST PLAN

e2e tests should run successfully (without parallelization in this branch)

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-io]

Codecov Report

Merging #12255 (c76792e) into master (ff0fe43) will decrease coverage by 15.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #12255       +/-   ##
===========================================
- Coverage   66.34%   51.29%   -15.05%     
===========================================
  Files         996      461      -535     
  Lines       49185    16772    -32413     
  Branches     4994     4300      -694     
===========================================
- Hits        32631     8603    -24028     
+ Misses      16402     8169     -8233     
+ Partials      152        0      -152     

Flag	Coverage Δ
cypress	51.29% <ø> (+5.90%)	⬆️
javascript	?
python	?

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

Impacted Files	Coverage Δ
...uperset-frontend/src/dashboard/util/dnd-reorder.js	0.00% <0.00%> (-100.00%)	⬇️
...rset-frontend/src/dashboard/util/getEmptyLayout.js	0.00% <0.00%> (-100.00%)	⬇️
...dashboard/components/resizable/ResizableHandle.jsx	0.00% <0.00%> (-100.00%)	⬇️
.../src/dashboard/util/getFilterScopeFromNodesTree.js	0.00% <0.00%> (-93.48%)	⬇️
...set-frontend/src/views/CRUD/alert/ExecutionLog.tsx	11.76% <0.00%> (-88.24%)	⬇️
...src/dashboard/components/gridComponents/Header.jsx	10.52% <0.00%> (-86.85%)	⬇️
superset-frontend/src/components/IconTooltip.tsx	13.33% <0.00%> (-86.67%)	⬇️
...rc/dashboard/components/gridComponents/Divider.jsx	13.33% <0.00%> (-86.67%)	⬇️
...end/src/SqlLab/components/ExploreResultsButton.jsx	8.00% <0.00%> (-84.00%)	⬇️
...nd/src/views/CRUD/data/query/QueryPreviewModal.tsx	14.70% <0.00%> (-82.97%)	⬇️
... and 869 more

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[robdiciuccio]

Closing due to security issue.