auth: add sessionDuration to aws_loginWithBrowser (aws#914)

We want to know about the previous sessionDuration, if there is one, the
next time we log in to the same SSO session due to something like
expiration.

We will use this in CloudWatch to alarm on if we are seeing a scenario
like BuilderID emitting another `aws_loginWithBrowser` less than 90 days
after the previous `aws_loginWithBrowser`.


<!---
    REMINDER:
    - Read CONTRIBUTING.md first.
    - Add test coverage for your changes.
    - Link to related issues/commits.
    - Testing: how did you test your changes?
    - Screenshots if applicable
-->

## License

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Signed-off-by: nkomonen-amazon <[email protected]>

Author: nkomonen-amazon

telemetry/definitions/commonDefinitions.json

@@ -2905,6 +2905,10 @@
                 {
                     "type": "result"
                 },
+                {
+                    "type": "sessionDuration",
+                    "required": false
+                },
                 {
                     "type": "source"
                 },