Update version comparison logic to be stable across releases

[mattchenderson]

This code should not need to be updated as new versions become available:

azure-functions-templates/Functions.Templates/Templates/HttpTrigger-CSharp-Isolated/.template.config/template.json

Lines 18 to 32 in d66e64f

	"Framework": {
	"type": "bind",
	"binding": "msbuild:TargetFramework",
	"defaultValue": "net6.0"
	},
	"NetFramework": {
	"type": "computed",
	"datatype": "bool",
	"value": "(Framework == \"net48\")"
	},
	"NetCore": {
	"type": "computed",
	"datatype": "bool",
	"value": "(Framework == \"net6.0\" || Framework == \"net7.0\" || Framework == \"net8.0\" || Framework == \"net9.0\")"
	},

This should instead parse the version and perform a comparison against the minimum.