fix(amazonq): emit sessionDuration

[chungjac]

Premature Builder ID Session Expiration Definition

/ Metric for premature expiration, specifically for BuilderId since we know the expected expiration time
// Basically, if the user has to log in to the browser again, we look at the time diff between last login.
// If the diff is too early (< 90 days) we assume premature. 

Problem

In the Premature Builder ID Session Expiration Cloudwatch graph, we do not have data for JB (either AmazonQForJetbrains or AwsToolkitForJetbrains products).

This is because we the EMF metric only gets created when our credentialStartUrl is https://view.awsapps.com/start and sessionDuration < 90 days, which means we aren't sending the correct data from the client

Solution

Emit sessionDuration field

Testing

Ran in sandbox and emit data to kibana. This is somewhat experimental, as I'm not able to fully replicate this scenario, but at least we can see what data we get in cloudwatch now after emitting this new field