fix(rest): allow nullable validation diff IDs

Author: kunzhao-nv

rest-api/openapi/oasdiff-breaking-changes-ignore.txt

@@ -226,6 +226,7 @@ GET /v2/org/{org}/nico/rack/validation the `diffs/items/actual/rackId` response'
 GET /v2/org/{org}/nico/rack/validation the `diffs/items/expected/id` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/rack/validation the `diffs/items/expected/rackId` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/rack/validation the `diffs/items/id` response's property type/format changed from `string`/`uuid` to `string, null`/`` for status `200`
+GET /v2/org/{org}/nico/rack/validation the response property `diffs/items/id` became nullable for the status `200`
 GET /v2/org/{org}/nico/rack/{id} the `components/items/id` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/rack/{id} the `components/items/rackId` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/rack/{id} the `id` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
@@ -234,6 +235,7 @@ GET /v2/org/{org}/nico/rack/{id}/validation the `diffs/items/actual/rackId` resp
 GET /v2/org/{org}/nico/rack/{id}/validation the `diffs/items/expected/id` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/rack/{id}/validation the `diffs/items/expected/rackId` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/rack/{id}/validation the `diffs/items/id` response's property type/format changed from `string`/`uuid` to `string, null`/`` for status `200`
+GET /v2/org/{org}/nico/rack/{id}/validation the response property `diffs/items/id` became nullable for the status `200`
 GET /v2/org/{org}/nico/task/run/{id}/target the `items/rackId` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/tray the `items/id` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/tray the `items/rackId` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
@@ -242,12 +244,14 @@ GET /v2/org/{org}/nico/tray/validation the `diffs/items/actual/rackId` response'
 GET /v2/org/{org}/nico/tray/validation the `diffs/items/expected/id` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/tray/validation the `diffs/items/expected/rackId` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/tray/validation the `diffs/items/id` response's property type/format changed from `string`/`uuid` to `string, null`/`` for status `200`
+GET /v2/org/{org}/nico/tray/validation the response property `diffs/items/id` became nullable for the status `200`
 GET /v2/org/{org}/nico/tray/{id} the `id` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/tray/{id} the `rackId` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/tray/{id}/validation the `diffs/items/actual/id` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/tray/{id}/validation the `diffs/items/actual/rackId` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/tray/{id}/validation the `diffs/items/expected/id` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/tray/{id}/validation the `diffs/items/expected/rackId` response's property type/format changed from `string`/`uuid` to `string`/`` for status `200`
 GET /v2/org/{org}/nico/tray/{id}/validation the `diffs/items/id` response's property type/format changed from `string`/`uuid` to `string, null`/`` for status `200`
+GET /v2/org/{org}/nico/tray/{id}/validation the response property `diffs/items/id` became nullable for the status `200`
 API POST /v2/org/{org}/nico/operating-system added the pattern `^(|smallest|/dev/(nvme[0-9]+n[0-9]+|sd[a-z]+|disk/by-id/[^/\s]+))$` to the request property `imageDisk`
 API PATCH /v2/org/{org}/nico/operating-system/{operatingSystemId} added the pattern `^(|smallest|/dev/(nvme[0-9]+n[0-9]+|sd[a-z]+|disk/by-id/[^/\s]+))$` to the request property `imageDisk`