[BUG] Cannot track exception from service worker

[christopher-kiss]

Description/Screenshot
Service worker will fail to trackException because there is an unchecked window reference for getting the stack.

Steps to Reproduce
init app insights inside a service worker with following config:

{ config: { instrumentationKey: 'key here', disableXhr: true, disableFetchTracking: false } })

call trackException(new Error('error')) and flush()

• OS/Browser: Windows 10 / Chrome 96
• SDK Version [e.g. 22]: 2.7.1
• How you initialized the SDK: new ApplicationInsights(snippet)

Expected behavior
Should be able to send track exception to app insights

Additional context
Add any other context about the problem here.
This error happens because we call window directly here:

ApplicationInsights-JS/shared/AppInsightsCommon/src/Telemetry/Exception.ts

Line 154 in 91ee603

} else if (window["opera"] && errorObj[strMessage]) {

This should most likely be getGlobalInst('opera') instead so that it safely bails out when window is not available.

[MSNev]

Now fully released

[github-actions]

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