[backport#16034] scripted-diff: Rename LockAnnotation to LockAssertion

Summary:
-BEGIN VERIFY SCRIPT-
git grep -l LockAnnotation | xargs sed -i 's/LockAnnotation/LockAssertion/'
-END VERIFY SCRIPT-

https://github.com/bitcoin/bitcoin/pull/16034/commits/9f85e9cb3d687862128ddf464d2bc2462b8627f0

Depends on D6261

Concludes backport of Core PR16034

Test Plan:

cmake .. -GNinja -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DENABLE_WERROR=ON -DENABLE_SANITIZERS=thread
ninja check-all

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D6262