Conformance test issue -- discovery test Oci-Filters-Applied should filter with emptyJSON artifactType

[MinerYang]

This issue is a sub-task of Distribution spec v1.1 phase3 epic (#19173)

• https://github.com/opencontainers/image-spec/blob/82e8329f7eb6df5c62924f2792d285ba276ae876/specs-go/v1/mediatype.go#L74
• https://github.com/opencontainers/image-spec/blob/main/manifest.md#guidance-for-an-empty-descriptor

DEBUG 
==============================================================================
~~~ REQUEST ~~~
GET  /v2/conformance/testrepo/referrers/sha256:a26a37c844f968cf5d61f8e56b71a6c6ca405b3f56fc95322d30182ba5d26024?artifactType=application%2Fvnd.nhl.peanut.butter.bagel  HTTP/1.1
HOST   : 10.202.250.166
HEADERS:
	Authorization: Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6Ik9UVzI6QTNWRTo2N09OOkRZRE86N1U0VjpTRjNJOjJCQzc6N1JFQzpWU0JQOlhFVFU6UTRQVzpHVFBIIiwidHlwIjoiSldUIn0.eyJpc3MiOiJoYXJib3ItdG9rZW4taXNzdWVyIiwic3ViIjoiYWRtaW4iLCJhdWQiOiJoYXJib3ItcmVnaXN0cnkiLCJleHAiOjE2OTM0NTg1NDYsIm5iZiI6MTY5MzQ1Njc0NiwiaWF0IjoxNjkzNDU2NzQ2LCJqdGkiOiJaVlNJSEpqOXZsODlTZDA1IiwiYWNjZXNzIjpbeyJ0eXBlIjoicmVwb3NpdG9yeSIsIm5hbWUiOiJjb25mb3JtYW5jZS90ZXN0cmVwbyIsImFjdGlvbnMiOlsicHVsbCIsInB1c2giLCJkZWxldGUiXX1dfQ.E-cb_tPpIXwWtYFCX8YkF78301Y1hg_olHoxUuoaQRpy6qTJ4rnO65_dO8igFD4D7Agw8ZoqCazIg4Yrnq9KzO0e_8vMnzBtQq2085LOefpflX3UutgwduHp6eG14eYLW7ETMY2NjahGUZhRMyTxVS_-LN9qDa3cLxQYls2nWy7nKWVeFb0erWP6bxFeCW4lzpjbRoA3gXgI_GhDAg6v9puFekSKyXN64vziepakSk_Bflu8-2llDavw6xUN5dIZ3Gr52LNTz4jUd1gxWWDwPjXmQ7vgvVi-WFh0y2ykoDV8mlXsoSt1JZu_4cIElQ3I6BPpTcSCvg6_a09BWMueY5mUPfwIBEvbUWZE1RbJ5xBED51m7MdnLHzatqFcEl6Tfaomujk9NcSZ5S92eNUQ6qwLy3uJP29dgC_3qncAVWXfDhCOD0I-PbSbKXGv4RnWGnocnAaiD8RvkaSW4Gf-NO4mFK2YnB1IUIbcnwUj8k9O5rW_C_wdtOkXwfEg5-qirWTEWpBg2iQrgn80bUAM4AUBukFwiiMm85-UyX4b2tsFLSCOvpIjd7Mb-AhjOm0YBDwamI1qKGVJwgU9KJZkg2E_GNEdhEeXKJFAmsHQYuBjOuZCMXrpxj3iXbtoEu0WWTTt8oomJHvfjmVHBr5xqLTvxeB0YUL_bGGRRuBo2NE
	User-Agent: distribution-spec-conformance-tests
BODY   :
***** NO CONTENT *****
------------------------------------------------------------------------------
~~~ RESPONSE ~~~
STATUS       : 200 OK
PROTO        : HTTP/1.1
RECEIVED AT  : 2023-08-31T04:39:06.849451641Z
TIME DURATION: 4.525069ms
HEADERS      :
	Connection: keep-alive
	Content-Length: 298
	Content-Security-Policy: frame-ancestors 'none'
	Content-Type: application/vnd.oci.image.index.v1+json
	Date: Thu, 31 Aug 2023 04:39:06 GMT
	Oci-Filters-Applied: application/vnd.nhl.peanut.butter.bagel
	Server: nginx
	Set-Cookie: sid=d3d374f9186cc5483237cb7cff2756ae; Path=/; HttpOnly
	Strict-Transport-Security: max-age=31536000; includeSubdomains; preload
	X-Frame-Options: DENY
	X-Request-Id: de54ea7e-5f57-4915-b93a-3bd1226fd49f
	X-Total-Count: 4
BODY         :
{
   "schemaVersion": 2,
   "mediaType": "application/vnd.oci.image.index.v1+json",
   "manifests": [
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "digest": "sha256:b97ae8dc0eb920e7d26074d66d5f370ede213aa2808f71df076724078d26cdf8",
         "size": 744,
         "artifactType": "application/vnd.nhl.peanut.butter.bagel"
      }
   ]
}

==============================================================================

Expected
: 1
to equal
: 2

[MinerYang]

monitoring oci spec1.1 rc