[CI] Refactor changed files integration (#9643)

# BEFORE
[run](https://github.com/twentyhq/twenty/actions/runs/12806801953)

![image](https://github.com/user-attachments/assets/f0a8ffe3-3fc0-42ca-b2ee-8a980606b5dd)
# AFTER
[run](https://github.com/twentyhq/twenty/actions/runs/12807034402)

![image](https://github.com/user-attachments/assets/5117c680-6804-416b-a8c8-bf00614ca453)

## Motivations:
- less workflow to whitelist as blocking for PRs
- less if condition per step

cons:
- quite verbose
- need to manually sync the `ci-NAME-status-check` needs list to any
other existing and should be dep jobs

## Version migration
Migrated to the latest `changed-files@45` version, getting rid of the
`set-output` usage warnings

## Tests runs:

With mutation:
- [Success
flow](https://github.com/twentyhq/twenty/actions/runs/12791958651/job/35661546343)
- [server-setup failure
flow](https://github.com/twentyhq/twenty/actions/runs/12792225779)
- [Other job failure
flow](https://github.com/twentyhq/twenty/actions/runs/12792313463), one
of the `inner` job failed
- [Manual cancel
flow](https://github.com/twentyhq/twenty/actions/runs/12792313463)
`ci-server-status-check` also has the `cancelled` status
- [Matrix
failure](https://github.com/twentyhq/twenty/actions/runs/12806883553)

Without mutation:
- [Nothing to do
flow](https://github.com/twentyhq/twenty/actions/runs/12792098384),
skipped `inner` job but `ci-server-status-check` still succeeded

## Notes
### Linter
We should setup a `yml` prettier and linter for the `.github/worfklows`
folder
### Centralized `ci-NAME-status-check` logic
Unfortunately I couldn't achieve to either make a `composite` action or
a `reusable-workflow`, as I could not access the correct layer to run
the `always` but also acessing the `needs` context

.github/workflows/changed-files.yaml

@@ -0,0 +1,27 @@
+name: Changed files reusable workflow
+on:
+  workflow_call:
+    inputs:
+      files:
+        required: true
+        type: string
+    outputs:
+      any_changed:
+        value: ${{ jobs.changed-files.outputs.any_changed }}
+
+jobs:
+  changed-files:
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    outputs:
+      any_changed: ${{ steps.changed-files.outputs.any_changed }}
+    steps:
+      - name: Fetch custom Github Actions and base branch history
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Check for changed files
+        id: changed-files
+        uses: tj-actions/changed-files@v45
+        with:
+          files: ${{ inputs.files }}