Updated SignInOutRepeatedlyTest such that it verifies that the sessio…

[BellringerQuinn]

…n ids each time are unique. In addition, exposed the session id in the SequenceAPI

This is done to verify that we won't be encountering sessionId mismatch errors due to re-using a session id on multiple auths

Docs Checklist

Please ensure you have addressed documentation updates if needed as part of this PR:

• I have created a separate PR on the sequence docs repository for documentation updates: Link to docs PR
• No documentation update is needed for this change.

[caballoninja]

Looks good to me

[andygruening]

Looks tiptop!