[#12946] Revert attributes removed in initialisation of MCS entities

[domlimm]

Part of #12946.

Outline of Solution
As per title.

For reference: #12948.

[github-actions]

Hi @domlimm, thank you for your interest in contributing to TEAMMATES!
However, your PR does not appear to follow our contribution guidelines:

• Title must start with the issue number the PR is fixing in square brackets, e.g. [#<issue-number>]
• Description must reference the issue number the PR is fixing, e.g. Fixes #<issue-number> (or Part of #<issue-number> if the PR does not address the issue fully)

Please address the above before we proceed to review your PR.

[weiquu]

The lint issues are caused by the spotBugs checks, so we need to suppress the FindBugs warnings. See comments below, still need to add import edu.umd.cs.findbugs.annotations.SuppressFBWarnings; right above import jakarta.persistence.CascadeType;

Otherwise looks fine

[domlimm]

@weiquu Thanks wq! Have made the changes. Will request for review once checks are completed.

[weiquu]

LGTM. Let's fix the other tests only after the current round of E2E tests migration is done