Improve error message if "parameters" contains "$ref"

[mikeharder]

PR Azure/azure-rest-api-specs#28160 is failing LintDiff with this error:

"!Error: Invalid Reference file: -- file:///mnt/vss/_work/1/azure-rest-api-specs/specification/common-types/resource-management/v5/types.json#/components/parameters/ApiVersionParameter"

We believe this is because the spec uses $ref under section parameters which is not allowed per the OAS2 spec.

AutoRest should try to improve this error message, to give spec authors more information what is wrong with their spec.

Teams discussion: https://teams.microsoft.com/l/message/19:[email protected]/1714671337559?tenantId=72f988bf-86f1-41af-91ab-2d7cd011db47&groupId=0cab4ce9-7691-42ae-82e3-460d4346a710&parentMessageId=1714671337559&teamName=ARM%20API%20Reviewers&channelName=ARM%20linter%20rules&createdTime=1714671337559&allowXTenantAccess=false