prefer system install of UCX in devcontainers (#501)

Contributes to rapidsai/build-planning#118

Proposes the following changes for pip devcontainers:

* prefer system installation of ucx to the one provided by the `libucx-cu{11,12}` wheels (ref: rapidsai/devcontainers#421 (comment))

And some other related changes noticed while doing that:

* update lingering `24.*` references to `25.02`

## Notes for Reviewers

### How I tested this

Relying on CI for most things. Double-checked that `update-version.sh` would have caught the one lingering `24.12` reference like this:

```shell
./ci/release/update-version.sh '25.02.00'
git grep -E '24\.'
```

Similar to rapidsai/cuml#6149

Authors:
  - James Lamb (https://github.com/jameslamb)

Approvers:
  - Bradley Dice (https://github.com/bdice)

URL: #501

.devcontainer/Dockerfile

@@ -13,6 +13,7 @@ RUN apt update -y \
  && rm -rf /tmp/* /var/tmp/* /var/cache/apt/* /var/lib/apt/lists/*;
 
 ENV DEFAULT_VIRTUAL_ENV=rapids
+ENV RAPIDS_LIBUCX_PREFER_SYSTEM_LIBRARY=true
 
 FROM ${BASE} as conda-base
 

.github/workflows/trigger-breaking-change-alert.yaml

@@ -12,7 +12,7 @@ jobs:
   trigger-notifier:
     if: contains(github.event.pull_request.labels.*.name, 'breaking')
     secrets: inherit
-    uses: rapidsai/shared-workflows/.github/workflows/breaking-change-alert.yaml@branch-24.12
+    uses: rapidsai/shared-workflows/.github/workflows/breaking-change-alert.yaml@branch-25.02
     with:
       sender_login: ${{ github.event.sender.login }}
       sender_avatar: ${{ github.event.sender.avatar_url }}