NO-ISSUE: Fix MCE 2.10 Konflux violations (#278)

Updates RPMS signature scan image to latest, trusted image.
Removes quay.expires-after tag from dockerfile.

Author: CrystalChun

.tekton/cluster-api-provider-agent-mce-210-pull-request.yaml

@@ -607,7 +607,7 @@ spec:
         - name: name
           value: rpms-signature-scan
         - name: bundle
-          value: quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan:0.2@sha256:7d1c087d7d33dd97effb3b4c9f3788e4c3138da2032040d69da6929e9a3aaceb
+          value: quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan:0.2@sha256:e127e0e0a5aab1364b560436594fe7ed67abcd5f8d6dd3ef14ac1f35cf81078c
         - name: kind
           value: task
         resolver: bundles

.tekton/cluster-api-provider-agent-mce-210-push.yaml

@@ -607,7 +607,7 @@ spec:
         - name: name
           value: rpms-signature-scan
         - name: bundle
-          value: quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan:0.2@sha256:7d1c087d7d33dd97effb3b4c9f3788e4c3138da2032040d69da6929e9a3aaceb
+          value: quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan:0.2@sha256:e127e0e0a5aab1364b560436594fe7ed67abcd5f8d6dd3ef14ac1f35cf81078c
         - name: kind
           value: task
         resolver: bundles

Dockerfile.rhtap

@@ -22,6 +22,3 @@ COPY --from=builder /workspace/manager .
 USER 65532:65532
 
 ENTRYPOINT ["/manager"]
-
-ARG QUAY_TAG_EXPIRATION
-LABEL "quay.expires-after"=${QUAY_TAG_EXPIRATION}