Make tests rely on gradle dependencies & split out test deps

[MrCreosote]

• TypeGeneratorTest no longer has its own list of jars; it just uses whatever gradle builds for it.
• Split out test dependencies separately since they were handled separately in TGT, although...
• it turns out that for every test, TTBOMATT, setUp[Test]Jars and [build|prepare]ClassPath are both always called and nothing happens between the calls that would be affected by the missing test jars, so there's no reason for the class path function to have a side effect of adding a couple jars to the libDir. As such sU[T]J now handles all jar copying.
  • that being said, these tests are hard to analyze...
• Keeping separate deps for eventual gradlization of the sdk modules.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.46%. Comparing base (5b24cc5) to head (7dfec7f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #220   +/-   ##
=========================================
  Coverage     71.46%   71.46%           
  Complexity      703      703           
=========================================
  Files            46       46           
  Lines          3715     3715           
  Branches        666      666           
=========================================
  Hits           2655     2655           
  Misses          826      826           
  Partials        234      234           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[briehl]

Looks good.