Add Department Actions Menu (#621)

[DanielRukwasha]

Closes #621

Wires the Actions dropdown on the Manage Departments page to real navigation:

• Trimmed the 4 placeholder links down to the 2 items the issue asked for: Allocation History and Department Personnel.
• Both now link to that row's Department Portal page (/department//), so the selected department is preserved through navigation instead of landing on a dead # link.

Branched off dep_portal_ad since that's where the current Manage Departments page redesign (with the placeholder dropdown) lives.

Tested locally end-to-end in the devcontainer: clicking the dropdown links navigates to the correct department's portal page, with that department pre-selected in the portal's department picker.

[DanielRukwasha]

@MImran2002 this is ready for review whenever you get a chance. Closes #621 as described above.

[MImran2002]

Please resolve the merge conflict

[DanielRukwasha]

@MImran2002 merge conflict resolved and pushed. Branch is up to date with dep_portal_ad and shows mergeable/clean now. Ready for another look whenever you get a chance. Thank you man

[fritzj2]

We were reviewing your PR and noticed a few things.
1.) The PR that this branch is merging into is outdated and missing a few key features.
2.) Some of the features that have been added in this PR have been resolved already, such as the allocation table (there is a PR for the members page as well).
3.) There is also a bit of broken additions to the PR with the app symlink being removed.
4.) Denys has been working closely with the manage department page, and it seems as if this action menu exists already in many PRs regarding the manage departments page, such as with #671, which attempts to add the full functionality of the menu.
I would talk to Brian about this issue to see where else it needs to go and for more information on it.