Test summary start time in locale causes issues with junit reporter

[JonnyPower]

Summary

The syncTests.ts and asyncTests.ts build test summary JSON with start times in local locale. Later, when using these summaries to generate a junit report, the Date constructor fails to construct a valid date, causing a failure at;

RangeError: Invalid time value
    at Date.toISOString (<anonymous>)
    at JUnitReporter.format (/Users/jpower/Code/sfpowerscripts/packages/core/node_modules/@salesforce/apex-node/src/reporters/junitReporter.ts:32:61)

Should the test summary just have an ISO date string for start time instead, given intention to programmatically parse again later in junit reporter?

Steps To Reproduce:

1. Setup machine to have a locale that will produce a date time string like: Sat Jul 22 2023 9:54:03 a.m. (like en-CA)
2. Run apex tests via apex-node
3. Use junit reporter to save results

Expected result

4. Expect correctly parsed date

Actual result

4. Error, invalid time value

Additional information

Apex library Version: "@salesforce/apex-node": "1.1.0"
OS and version: Darwin TRAC-C02F314EML7L 22.5.0 Darwin Kernel Version 22.5.0: Thu Jun 8 22:22:22 PDT 2023; root:xnu-8796.121.3~7/RELEASE_X86_64 x86_64

[shetzel]

This should be fixed with #334. Please reopen if the problem still occurs.