Update the `builds.json` format in s3

[gursewak1997]

After the initial round of garbage collection, we updated the builds.json for Rawhide and Branched. We pruned the cloud-uploads and added the following to the respective build info in the JSON file.

{
   "policy-cleanup": [
         "cloud-uploads"
   ]
},

Now, we need to update the policy-cleanup type from a list to a dict if we are looking to add the images-kept to it to have something like this.

// Valid JSON
{
    "policy-cleanup": {
        "cloud-uploads": True,
        "images": True
        "images-kept": ["qemu", "live-iso"] 
    }
}

To get to that, let's first have the builds.json manually changed for those two streams. Basically changing the "cloud-uploads" to "cloud-uploads": true

[gursewak1997]

Updated the files.