Fix integration tests without the test name the pytest requires

[exploreriii]

We have two integration tests that have no test prefix or postfix, so pytest will ignore them

tests/integration/token_airdrop_transaction_claim_e2e.py
tests/integration/test_token_fee_schedule_update_transaction_e2e.py
tests/integration/token_airdrop_transaction_cancel_e2e.py

SOLUTION
we should name them with _test.py and resolve any integration test failures

[exploreriii]

Closed as completed in #762