test : added pytest unit tests for ResourceGuard class

[tmdeveloper007]

Closes #1903.

Summary of What Has Been Done:
Added 10 pytest unit tests for services/resource_guard.py covering ResourceGuard timeouts, row-count limits, accumulated row tracking, and check_resource_limits enforcing both constraints. Uses unittest.mock.patch to control time.time() for timeout tests without additional dependencies.

Changes Made:

• tests/test_resource_guard.py (new file)

Impact it Made:

• Validates resource exhaustion protection for large CSV uploads
• All 10 tests pass locally

Note: Please assign this PR to the tmdeveloper007 account.

[vercel]

@tmdeveloper007 is attempting to deploy a commit to the gopaljilab's projects Team on Vercel.

A member of the Team first needs to authorize it.