RFR: Only consider resolved backports when applying sync label [v2]

[Robin Westberg]

> Issues that are still open should not be considered when calculating which issues should have the sync label applied.

Robin Westberg has updated the pull request incrementally with one additional commit since the last revision:

  Fix failing test

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Changes:
  - all: https://git.openjdk.java.net/skara/pull/952/files
  - new: https://git.openjdk.java.net/skara/pull/952/files/4229cfb8..f943734e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=952&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=952&range=00-01

  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/952.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/952/head:pull/952

PR: https://git.openjdk.java.net/skara/pull/952