feat(trace-eap-waterfall): Fixing link to profile from trace drawer

[Abdkhan14]

This PR resolves two issues:

1. This ISSUE, where the replay shows users clicking on profile links in the drawer:

• This is from passing '' profile ids that passed the defined guard that only asserts undefined and null
• Removed all redundant usage of defined

2. There is a difference between the profiles that we link to from the old txn based trace view and the new spans only trace view:

• This is because, we were looking for thread.id in eap spans. This attr is not passed with the eap span response type from the new /trace/ endpoint. We want to restrict the size of the response for performance, we don't want to add the threadId to every row in the response atm.
• The solution for now is to just fetch and use the corresponding nodestore transaction data, to be consistent. We are already doing this for the context section in span details (i.e. everything that eap doesn't support yet like attachments), it's not an anti-pattern atm.

[edwardgou-sentry]

nit: you should be able to do data: eventTransaction = null so you dont need to define another variable here