refactor: minor typing improvements

[bradenmacdonald]

Description

This makes some minor typing improvements in our test code, seen while reviewing #2324

Specifically instead of just {...} as XBlock which is an unsafe cast, we can use {...} satisfies Partial<XBlock> as XBlock which is a safer cast that lets you omit fields but requires that the fields you do include have the correct type.

Supporting information

Private ref FAL-4228

Testing instructions

No runtime changes so no manual testing needed; make sure tests are green.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.54%. Comparing base (2f6e510) to head (a554c5f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2395   +/-   ##
=======================================
  Coverage   94.54%   94.54%           
=======================================
  Files        1174     1174           
  Lines       25322    25322           
  Branches     5543     5543           
=======================================
  Hits        23940    23940           
  Misses       1313     1313           
  Partials       69       69           

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[ChrisChV]

Looks good! 👍