fix: add more mock time values in test_prime_offload_tester to handle (Bugfix)

[seankingyang]

Description

add more mock time values in test_prime_offload_tester to handle

The check_offload() method makes 5 time.time() calls in the failure scenario:
Call #1: deadline = time.time() + timeout → returns 0, sets deadline to 1
Call #2: while time.time() < deadline: → returns 0, check 0 < 1 = True, enters loop
Call #3: while time.time() < deadline: → returns 1, check 1 < 1 = False, exits loop
Call #4: self.logger.info("Checking fail:") → LogRecord creation calls time.time() → returns 2 (ref: https://docs.python.org/3/library/logging.html#logrecord-attributes)
Call #5: self.logger.info(" Couldn't find process") → LogRecord creation calls time.time() → returns 3

ref: python3 -c "import logging, inspect; print(inspect.getsource(logging.LogRecord.__init__))" , https://github.com/python/cpython/blob/main/Lib/logging/__init__.py#L283

Resolved issues

PR #2162
https://github.com/canonical/checkbox/actions/runs/18641071113/job/53139932346?pr=2162

Documentation

Tests

cherry pick this commit
https://github.com/canonical/checkbox/actions/runs/18641579136/job/53141487716?pr=2162

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.86%. Comparing base (1ad5e7a) to head (953f39a).
⚠️ Report is 102 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2166   +/-   ##
=======================================
  Coverage   52.86%   52.86%           
=======================================
  Files         395      395           
  Lines       42636    42636           
  Branches     7906     7906           
=======================================
  Hits        22538    22538           
  Misses      19295    19295           
  Partials      803      803           

Flag	Coverage Δ
provider-base	29.33% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[hanhsuan]

LGTM, Thanks for finding this bug in the unit test.