Preparatory changes for migrating TP Converter unit tests to be configured using ComponentAccumulator

This merge request adds changes to allow individual TP Converter unit tests from the old-style to ComponentAccumulator-based configuration. The idea is to leave the test output unchanged, possibly reducing the number of unnecessary Athena components that are configured. The old-style test function has been renamed from run_tpcnv_test to run_tpcnv_legacy_test in the CMakeLists.txt files. The CA-based tests will use the run_tpcnv_test function, so once the migration is complete the syntax will look as before. (The bulk of the files changed are due to this.)