test: enhance test-timers
In test-timers, confirm that all input values that should be coerced to 1 ms are not being coerced to a significantly larger value.
This eliminates the need for the separate test-regress-GH-897.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
test timers