fix: {ta, test results}_finisher tasks

[joseph-sentry]

they were previously trying to call
self.schedule_new_user_activated_task, which didn't exist on either of those tasks

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: tasks/test_results_finisher.py

Function	Unhandled Issue
process_impl_within_lock	AttributeError: 'NoneType' object has no attribute 'pullid' app.tasks.test_results.TestResultsF... Event Count: 35
process_impl_within_lock	Plan.DoesNotExist: Plan matching query does not exist. app.tasks.test_results.TestResultsFinish... Event Count: 11

---

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.52%. Comparing base (8d5485f) to head (f3986de).
Report is 7 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
tasks/ta_finisher.py	50.00%	1 Missing ⚠️
tasks/test_results_finisher.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1062   +/-   ##
=======================================
  Coverage   97.52%   97.52%           
=======================================
  Files         463      463           
  Lines       38073    38076    +3     
=======================================
+ Hits        37132    37135    +3     
  Misses        941      941           

Flag	Coverage Δ
integration	42.84% <50.00%> (+<0.01%)	⬆️
unit	90.21% <50.00%> (+<0.01%)	⬆️

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[github-actions]

✅ All tests successful. No failed tests were found.

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