Add direct test execution to pre-commit hook

## Summary

Add direct test execution step to the pre-commit hook to catch test failures before commits.

## Current State

The pre-commit hook (`scripts/pre-commit.sh`) currently runs:

- `pants lint` on changed files
- `pants check` (type checking) on changed files

## Proposed Change

Add test execution for directly affected tests before allowing commits.

JIRA Issue: BA-3387