fix: type errors and missing return

[Huy-DNA]

Summary

Fix the problems as pointed out in: https://holistics.slack.com/archives/C0278BDLPK8/p1706870126558909.
NO breaking change is introduced!

• Add the missing return after creating the new Report, make that line meaningless
• Add the check whether container.name is an instance of an IdentifierStream node, otherwise, there will be an uncaught error when it's actually a PrimaryExpresssionNode.
• Add the any assertion.

Issue

(issue link here)

Lasting Changes (Technical)

(please list down: code changes/things that have wide-effect; new libraries/functions added that can be used by others; examples below)

• (Added class EmailValidator to validate email address' validity)
• (Added Tenant#is_trial? check)

Checklist

Please check directly on the box once each of these are done

• Documentation (if necessary)
• Tests (integration test/unit test)
• Integration Tests Passed
• Code Review

[nguyenalter]

LGTM!