test: Fix act errors in DatasourceControl test

[lyndsiWilliams]

SUMMARY

This PR fixes 10 act errors in superset-frontend/src/explore/components/controls/DatasourceControl/DatasourceControl.test.tsx

TESTING INSTRUCTIONS

• cd into superset-frontend/src/explore/components/controls/DatasourceControl
• run npm run test superset-frontend/src/explore/components/controls/DatasourceControl/DatasourceControl.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 #21426 (7442ed4) into master (14cd8a2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #21426   +/-   ##
=======================================
  Coverage   66.55%   66.55%           
=======================================
  Files        1791     1791           
  Lines       68593    68593           
  Branches     7319     7319           
=======================================
  Hits        45653    45653           
  Misses      21049    21049           
  Partials     1891     1891           

Flag	Coverage Δ
hive	52.94% <ø> (ø)
javascript	52.73% <ø> (ø)
mysql	80.78% <ø> (ø)
postgres	80.83% <ø> (ø)
presto	52.84% <ø> (ø)
python	81.30% <ø> (ø)
sqlite	79.37% <ø> (ø)
unit	50.96% <ø> (ø)

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