Fix volunteer spreadsheet tests for term and senior results

[BhushanSah]

Issue Description

The spreadsheet CI tests were failing because the expected test output no longer matched the current spreadsheet behavior.

getUniqueVolunteers() now returns a Term column, but the test still expected only Full Name, Email, and B-Number.

graduatingSeniorsVolunteerHours() can also return existing senior records from the database, so the test should not expect the entire result list to be empty or only contain the test-created users.

Changes

• Updated test_getUniqueVolunteers to include the Term column in the expected output.
• Added expected term values to each unique volunteer row.
• Updated test_graduatingSeniorsVolunteerHours to check for specific test users instead of assuming the full result list is empty.
• Adjusted Bob Builder’s expected semester count and total hours after adding another unique service semester.
• Added checks to make sure non-senior students are still excluded.
• Added checks to make sure non-service events do not increase the service semester count.

Testing

• Ran:

pytest tests/code/test_spreadsheet.py -q

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