Experimental options such as TPM need to visibly reflect subiquity return values

[fossfreedom]

Raised from https://bugs.launchpad.net/subiquity/+bug/2037234

2023-09-24 22:23:24.269117 DEBUG subiquity_client: ==> getGuidedStorageV2(true) {"status": "DONE", "error_report": null, "configured": null, "targets": [{"disk_id": "disk-sda", "allowed": ["DIRECT", "LVM", "LVM_LUKS", "ZFS"], "disallowed": [], "$type": "GuidedStorageTargetReformat"}, {"allowed": ["MANUAL"], "disallowed": [], "$type": "GuidedStorageTargetManual"}]}

The client should not have shown you the TPM encryption option in this case (it doesn't look as if the ISO even suports this as an option).

On ubuntu-budgie-installer the TPM experimental option is visible and able to be selected; subiquity says "disallowed" - so the option should be invisible/disabled ?