Add bulk actions (reconcile, suspend, resume, delete) for selected resources in UI #863

Right now, you can only perform actions like reconcile, suspend, or resume on one resource at a time. It should be possible to select multiple resources and trigger these actions for all of them together.

This will make things much easier when you need to operate on many resources at once (for example: suspending all HelmReleases, or reconciling all failed resources). Bulk actions save a lot of time and make it easier for operators to manage large environments. Many similar tools support this.