test: Fix act errors in AddDataset test

[lyndsiWilliams]

SUMMARY

This PR fixes 3 act errors in superset-frontend/src/views/CRUD/data/dataset/AddDataset/AddDataset.test.tsx

TESTING INSTRUCTIONS

• cd into superset-frontend/src/views/CRUD/data/dataset/AddDataset
• run npm run test superset-frontend/src/views/CRUD/data/dataset/AddDataset/AddDataset.test.tsx
• Observe that there are no act errors in the console

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 #21381 (4fd341d) into master (834ec7e) will increase coverage by 0.16%.
The diff coverage is n/a.

❗ Current head 4fd341d differs from pull request most recent head 276c42c. Consider uploading reports for the commit 276c42c to get more accurate results

@@            Coverage Diff             @@
##           master   #21381      +/-   ##
==========================================
+ Coverage   66.44%   66.61%   +0.16%     
==========================================
  Files        1791     1791              
  Lines       68559    68559              
  Branches     7319     7319              
==========================================
+ Hits        45557    45671     +114     
+ Misses      21116    21002     -114     
  Partials     1886     1886              

Flag	Coverage Δ
javascript	52.80% <ø> (ø)

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

Impacted Files	Coverage Δ
superset/utils/core.py	90.00% <0.00%> (+0.11%)	⬆️
superset/models/core.py	89.04% <0.00%> (+0.23%)	⬆️
superset/db_engine_specs/base.py	88.32% <0.00%> (+0.31%)	⬆️
superset/connectors/sqla/models.py	90.60% <0.00%> (+0.69%)	⬆️
superset/models/sql_lab.py	76.89% <0.00%> (+1.99%)	⬆️
superset/db_engine_specs/presto.py	87.95% <0.00%> (+6.62%)	⬆️
superset/db_engine_specs/hive.py	87.10% <0.00%> (+16.01%)	⬆️
superset/db_engines/hive.py	85.18% <0.00%> (+85.18%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more