HPCC-32857 ECL Watch v9 Logs grid timestamp formatter

[jeclrsg]

fixes an issue with the ECL Watch v9 Logs viewer potentially having an uncaught JS exception if the logging engine is misconfigured and the value provided as the "timestamp" for a log message cannot be converted to a valid date

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[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-32857

Jirabot Action Result:
Workflow Transition To: Merge Pending
Updated PR

[GordonSmith]

I think the correct way to test if a JS Date is valid is !isNaN(date) or even better date instanceof Date && !isNaN(date)?

[jeclrsg]

new Date("asdf") is an instanceof Date, and TypeScript wouldn't allow just isNaN(date), so had to add the .getTime()