chore(STONEINTG-1189): annotate PLR when component is missing

This fixes a silent failure where the Build PipelineRun would stall if
the appstudio.openshift.io/component label was incorrect, not found,
or missing entirely.

Changes:
* Added logic to catch "Component Not Found" errors during loader.
* Added logic to catch cases where the component label is nil.
* In both cases, the PipelineRun is now annotated with
  test.appstudio.openshift.io/create-snapshot-status="failed".
* Ensured Finalizer is removed if component is not found, allowing
  resource deletion.

Testing:
* Added unit tests in buildpipeline_controller_test.go covering
  both scenarios.

Generated-by: Cursor

Signed-off-by: jcullina <[email protected]>

Author: jencull

internal/controller/buildpipeline/buildpipeline_controller.go

@@ -19,6 +19,7 @@ package buildpipeline
 import (
 	"context"
 	"fmt"
+
 	"github.com/konflux-ci/integration-service/cache"
 	"k8s.io/client-go/util/retry"