Add a linter to enfore unit tests file name/boost name match and unicity

Summary:
This linter will warn if:

• The BOOST_FIXTURE_TEST_SUITE name does not match the file name
• The test name is not unique

Also add an entry in the dev notes.

Based on core PR12719 and PR12859

Test Plan:
Should return nothing:

./test/lint/lint-tests.sh

Rename the BOOST_FIXTURE_TEST_SUITE name in
src/wallet/test/wallet_crypto_tests.cpp to crypto_tests.

./test/lint/lint-tests.sh

Check the mismatch and the duplicata are detected

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: teamcity, schancel

Differential Revision: https://reviews.bitcoinabc.org/D2532