Add yardstick labels symlink to gitignore #390

Job	Run time
Unit tests (Go)	1m 42s
Build snapshot artifacts	1m 57s
Static analysis	3m 39s
Discover supported schema versions	3s
CLI tests (Python)	4m 48s
Unit tests (Python)	52s
Acceptance tests (1)	11m 29s
Acceptance tests (2)	11m 48s
Acceptance tests (3)	11m 46s
Acceptance tests (4)	11m 45s
Acceptance tests (5)	10m 26s
CLI tests (Go-Linux)	1m 47s
	1h 12m 2s

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