Ordering of imagePullSecrets in deployment is random, causing repeated changes to Deployment

[amisevsk]

Description

When creating a workspace deployment, DWO searches for secrets with the label controller.devfile.io/devworkspace_pullsecret and adds them to the pod's imagePullSecrets. However, this list of secrets is not sorted, and so separate reconciles can modify the workspace deployment, swapping the order of imagePullSecrets. This results in the workspace pod randomly restarting when the workspace is reconciled, and can prevent workspace startup.

How To Reproduce

1. Create multiple secrets with the controller.devfile.io/devworkspace_pullsecret: true label (controller.devfile.io/watch-secret: true is also required).
2. Start a DevWorkspace
3. Check if workspace pod is repeatedly rolled out (setting enableExperimentalFeatures in the DevWorkspaceOperatorConfig will show changes made to the workspace deployment)

Expected behavior

Updates should only be submitted to the cluster if an imagePullSecret needs to be added/removed.

Additional context