team: delete duplicate TEAMS.yaml file

There's no reason for this to be checked into the repo twice; the copy
in the repo root is sufficient.

Release note: none
Epic: none

Author: rickystewart

.gitignore

@@ -58,6 +58,7 @@ build/variables.mk
 *.pb.gw.go
 pkg/ccl/kvccl/kvtenantccl/upgradeinterlockccl/generated_test.go
 pkg/backup/data_driven_generated_test.go
+pkg/internal/teams/TEAMS.yaml
 pkg/testutils/serverutils/*_generated.go
 
 # Temporary directories during gomock generate