Add labels to benchmarks

Proposal:

  labels:
    suite: theodolite-stream-processing
    benchmark: uc1
    sut: flink

changed milestone to %0.9.0

added modul/benchmarks label

assigned to @she

closed with commit 8a1011f1

mentioned in issue #403 (closed)

mentioned in commit 8a1011f1

mentioned in commit 677f44e4