Improves reliability of a few wiring/no_fixture tests

[technobly]

Problem

• wiring/no_fixture SYSTEM/THREAD/TIME all had some intermittent tests

Solution

• improve reliability of SYSTEM/THREAD/TIME tests

Steps to Test

• for SYSTEM/THREAD tests, run wiring/no_fixture via integration test runner as that was what was required to see the issue
  device-os/user/tests/integration $ device-os-test run boron wiring/no_fixture -v

• run TIME tests via TEST=wiring/no_fixture with only TIME_19 compiled in, and use the new repeat feature to run this test 5000 times. It should not fail.

Repeat tests how many times?: 5000
Repeating tests 5000 times!
Running tests
...
Test TIME_19_LocalTimeIsCloseToNtpTime passed.
Test [5000/5000]:1 passed, 0 failed, 0 skipped, out of 1 tests(s).
Total [5000/5000]: 5000 passed, 0 failed
Average [5000/5000]: 100.0% passed, 0.0% failed

NOTE: for now, the repeat unit-test feature was removed as it was increasing the user app size and making the slo/startup integration test fail.

References

• sc-98866
• sc-97562

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Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• [N/A] Added documentation
• Added to CHANGELOG.md after merging (add links to docs and issues)

[keeramis]

Approving to unblock the release - Yet to verify the tests are fully passing across all the rigs.

cc: @technobly