Revert "tmp skip" (#28295)

This reverts commit 9d9a3db.

Author: joshblum

go/chat/attachment_httpsrv_test.go

@@ -200,7 +200,6 @@ func TestChatSrvAttachmentHTTPSrv(t *testing.T) {
 }
 
 func TestChatSrvAttachmentUploadPreviewCached(t *testing.T) {
-	t.Skip() // TODO
 	ctc := makeChatTestContext(t, "TestChatSrvAttachmentUploadPreviewCached", 1)
 	defer ctc.cleanup()
 	users := ctc.users()

go/chat/emojisource_test.go

@@ -55,7 +55,6 @@ func checkEmoji(ctx context.Context, t *testing.T, tc *kbtest.ChatTestContext,
 }
 
 func TestEmojiSourceBasic(t *testing.T) {
-	t.Skip() // TODO
 	useRemoteMock = false
 	defer func() { useRemoteMock = true }()
 	ctc := makeChatTestContext(t, "TestEmojiSourceBasic", 1)
@@ -309,7 +308,6 @@ func TestEmojiSourceAliasDecorate(t *testing.T) {
 }
 
 func TestEmojiSourceCrossTeam(t *testing.T) {
-	t.Skip() // TODO
 	useRemoteMock = false
 	defer func() { useRemoteMock = true }()
 	ctc := makeChatTestContext(t, "TestEmojiSourceCrossTeam", 4)

go/chat/unfurl_test.go

@@ -106,7 +106,6 @@ func (p *ptsigner) Sign(payload []byte) ([]byte, error) {
 }
 
 func TestChatSrvUnfurl(t *testing.T) {
-	t.Skip() // TODO
 	runWithMemberTypes(t, func(mt chat1.ConversationMembersType) {
 		switch mt {
 		case chat1.ConversationMembersType_KBFS: