Invalid format: "00:00:18" is not NET duration

[Shazwazza]

Hi, I've noticed that on some special occasions the dotnet trx file will output a duration that isn't parsed by this regex:

test-reporter/src/utils/parse-utils.ts

Line 3 in 10ba394

const durationRe = /^(\d\d):(\d\d):(\d\d\.\d+)$/

I'm unsure under what circumstances this duration ends up being different from the others but seems its possible to end up with a format other than the typical 00:00:00.0120000 style. Below is the xml fragment causing the issue:

<UnitTestResult executionId="a35d36d2-be5e-4df1-97bf-edcf5bb32fbe" testId="c09012a9-dca9-30d9-25de-f0be315359ca" testName="Index_Read_And_Write_Ensure_No_Errors_In_Async(2000,5000,20,50,100,50,True)" computerName="fv-az28-465" duration="00:00:18" startTime="2021-03-22T23:52:27.0000000+00:00" endTime="2021-03-22T23:52:45.0000000+00:00" testType="13cdc9d9-ddb5-4fa4-a97d-d965ccfc6d4b" outcome="Passed" testListId="8c84fa94-04c1-424b-9868-57a2d4851a1d" relativeResultsDirectory="a35d36d2-be5e-4df1-97bf-edcf5bb32fbe">

where duration="00:00:18" so seems like the milliseconds are optional.