ci: move continue-on-error from job level to step level

Job-level continue-on-error only prevents workflow failure but the job
itself still reports as failed, which blocks PRs when the job is a
required status check. Moving it to the step level makes the job
conclude as success while still surfacing failures in the step output.

Also re-enables detect-breaking-changes (was disabled with if: false)
with step-level soft-fail so it runs but does not block.

Refs: APIX-852

Author: musa-cf

.github/workflows/ci.yml

@@ -97,6 +97,7 @@ jobs:
         run: ./scripts/bootstrap
 
       - name: Run tests
+        continue-on-error: true
         run: ./scripts/test
         env:
           UV_PYTHON: ">=3.9.0"

.github/workflows/detect-breaking-changes.yml

@@ -9,7 +9,6 @@ jobs:
   detect_breaking_changes:
     runs-on: 'ubuntu-latest'
     name: detect-breaking-changes
-    if: false
     permissions:
       contents: read
     steps:
@@ -29,10 +28,12 @@ jobs:
       - name: Install dependencies
         run: uv sync --all-extras
       - name: Detect removed symbols
+        continue-on-error: true
         run: |
           uv run python scripts/detect-breaking-changes.py "${{ github.event.pull_request.base.sha }}"
 
       - name: Detect breaking changes
+        continue-on-error: true
         run: |
           # Try to check out previous versions of the breaking change detection script. This ensures that
           # we still detect breaking changes when entire files and their tests are removed.