generate/verify schema .. had forgotten to update schema.json for neuron devices

[dims]

found via an integration test failure. we should flag this as quickly as possible, so added a generate/check make target so we don't get tripped up.

[0] Utils schema [It] displays the schema
[0] /__w/eksctl-ci/eksctl-ci/eksctl/integration/tests/utils/utils_test.go:30
[0] 
[0]   [FAILED] Expected
[0]       <string>: "...    "neuron..."
[0]   to equal               |
[0]       <string>: "...    "vCPUs"..."
[0]   In [It] at: /__w/eksctl-ci/eksctl-ci/eksctl/integration/tests/utils/utils_test.go:34 @ 02/26/25 19:19:50.931

[bryantbiggs]

awesome!