Add JSON formatting check to the add-ign function

[skyblaster]

Fixes #187

[openshift-ci]

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[baude]

@skyblaster if you can fix the test failure, ill review and merge.

[skyblaster]

@baude I'm unfamiliar with these particular tests, and not sure why it's failing, so will have to defer to @ashley-cui

If I download libhvee-0.6.0 or later releases, and run .\winmake.ps1 localtest on my local machine, I see the exact same errors.
If I simply run .\winmake.ps1 binaries, the executables are built without any errors.

[skyblaster]

With a little debugging, I can say that the following URL needs to be updated as it results in a 404 which causes the win_test error:

libhvee/test/e2e/fedora_test.go

Line 18 in 24e21b4

fedoraBaseDirEndpoint = "https://kojipkgs.fedoraproject.org/compose/cloud/latest-Fedora-Cloud-39/compose"

Unfortunately it's not as simple as changing 39 to 40 or 41, as the new VHD images are compressed.

Example from 39: https://kojipkgs.fedoraproject.org/compose/metadata-archive/2024/Fedora-Cloud-39-20241126.0/images.json

                    {
                        "arch": "x86_64",
                        "bootable": false,
                        "checksums": {
                            "sha256": "b0ec83ff08499959ab9590cafc1d71645a48962ca10fbecf2aca2f6f3e0945ab"
                        },
                        "disc_count": 1,
                        "disc_number": 1,
                        "format": "vhd",
                        "implant_md5": null,
                        "mtime": 1732602402,
                        "path": "Cloud/x86_64/images/Fedora-Cloud-Base-Azure-39-20241126.0.x86_64.vhd",
                        "size": 1292184064,
                        "subvariant": "Cloud_Base",
                        "type": "vpc",
                        "volume_id": null
                    },

New compressed format: https://kojipkgs.fedoraproject.org/compose/cloud/latest-Fedora-Cloud-41/compose/metadata/images.json

                    {
                        "arch": "x86_64",
                        "bootable": false,
                        "checksums": {
                            "sha256": "c668dc15cddfae34649cb719c785bcbfdff858b10b2394fb6569bd676befa31a"
                        },
                        "disc_count": 1,
                        "disc_number": 1,
                        "format": "vhd.xz",
                        "implant_md5": null,
                        "mtime": 1734333904,
                        "path": "Cloud/x86_64/images/Fedora-Cloud-Base-Azure-41-20241216.0.x86_64.vhdfixed.xz",
                        "size": 527791932,
                        "subvariant": "Cloud_Base",
                        "type": "vhd-compressed",
                        "volume_id": null
                    },

[skyblaster]

@baude I took a stab at fixing the e2e testing and it now passes.
The path to 41 seems to have disappeared, so I had to use 40.

I'm not sure why it appears to copy the decompressed image twice, so please have a look https://cirrus-ci.com/task/6376975813574656

Sorry for the lack of a sign-off. Please let me know if I should rebase, or resubmit the PR.