CIDC-1646 fix counting bug

[scvannost]

What

Fix counting bug where WES tumor-only assay counting can be affected by repeated IDs in other trials.

Why

Discovered in validation of Essex testing data on staging.

How

Restrict join to be also on trial_id

Remarks

• Did not add test to prevent reversion
• Did not check for other counting subqueries for similar effects

Checklist

Please include and complete the following checklist. You can mark an item as complete with the - [x] prefix:

• Tests - Added unit tests for new code, regression tests for bugs and updated the integration tests if required
• Formatting & Linting - black and flake8 have been used to ensure styling guidelines are met
• Type Annotations - All new code has been type annotated in the function signatures using type hints
• Docstrings - Docstrings have been provided for functions
• Documentation - README and CHANGELOG have been updated to explain major changes & new features
• Package version - Manually bumped the API package version in init.py