Update timings.json

Summary:
As per title.
Might improve the extended functional tests a bit by delaying the
pruning test.
This also adds several new tests to the list.
No change to the default extended list.

Test Plan:

./test/functional/test_runner.py --extended

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D4573