fix: Fix unit tests CI and failing tests (#2928)

# What does this PR do?
<!-- Provide a short summary of what this PR does and why. Link to
relevant issues if applicable. -->
- Added `set -e` to the beginning of the unit test script to ensure the
script exits on failure and correctly fails the CI when tests do not
pass.
- Fixed all unit tests that were silently failing in the CI.
- Fixed Python 3.13 unit test CI failing silently.

<!-- If resolving an issue, uncomment and update the line below -->
<!-- Closes #[issue-number] -->
Closes #2877 

## Test Plan
<!-- Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.* -->
- **Previously:** Unit tests passing in CI eventhough it failed 11 tests
->
[CI-run](4683681501 (step):4:2097)
- **Made the fix. Now, ensuring CI fails as expected on test failures:**
Unit tests failing in CI with 1 failed test ->
[CI-run](4684234247 (step):4:1506)
- This PR shows the CI passing and all unit tests passing.

.github/workflows/unit-tests.yml

@@ -35,6 +35,8 @@ jobs:
 
       - name: Install dependencies
         uses: ./.github/actions/setup-runner
+        with:
+          python-version: ${{ matrix.python }}
 
       - name: Run unit tests
         run: |