[WIP] feat: iface activated

[ANISH-SR]

Summary of Changes

• Enforced iface.status == InterfaceStatus::Activated before unlinking.
• Returns DoubleZeroError::InvalidStatus if the interface is not activated.
• CHANGELOG.md updated.

Testing Verification

• rust & ci checks pass.

Closes #2230

[juan-malbeclabs]

LGTM

[juan-malbeclabs]

@ANISH-SR The e2e test is failing: could you take a look? It seems the change may leave the interface in an invalid state. Thanks.

[ANISH-SR]

Hi @juan-malbeclabs , I looked into the e2e failure and it seems to be quite a hassle here. if this change is not immediately needed, I'll go ahead and draft this for now. Rest assured, I'll recommit with some unit tests for the change. Thanks a ton :)

[martinsander00]

@ANISH-SR Hi, lmk how this goes. We would like to finish there Ottersec issues soonish.

[ANISH-SR]

@ANISH-SR Hi, lmk how this goes. We would like to finish there Ottersec issues soonish.

I have added integration tests here. Can confirm all the local checks passing! Can you review it @martinsander00 , thanks

[ANISH-SR]

fixed the merge conflict

[martinsander00]

@ANISH-SR looks like there are still tests and linting errors