Add yardstick labels symlink to gitignore #389

Job	Run time
Build snapshot artifacts	2m 8s
Static analysis	4m 30s
Discover supported schema versions	4s
CLI tests (Python)	4m 42s
Unit tests (Go)	1m 41s
Unit tests (Python)	39s
Acceptance tests (1)	11m 48s
Acceptance tests (2)	12m 4s
Acceptance tests (3)	12m 6s
Acceptance tests (4)	12m 5s
Acceptance tests (5)	11m 3s
CLI tests (Go-Linux)	1m 57s
	1h 14m 47s

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