RFR: 1432: The command `/csr unneeded` doesn't correctly handle an approved CSR

[Guoxiong Li]

Hi all,

Currently, when using the command `/csr unneeded` and the PR doesn't have `csr` label, the `CSRCommand` can't distinguish the situations of having no csr request and having an approved csr request. This patch removes the conditional statement `labels.contains(CSR_LABEL)` of the method `CSRCommand::handle` so that its following code can distinguish the different situations and reply different messages.

And the code about removing `csr` label is moved to the method `csrUnneededReply` to reduce some duplication.

Thanks for taking the time to review.

Best Regards,
-- Guoxiong

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Commit messages:
 - SKARA-1432

Changes: https://git.openjdk.java.net/skara/pull/1331/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1331&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1432
  Stats: 29 lines in 2 files changed: 10 ins; 11 del; 8 mod
  Patch: https://git.openjdk.java.net/skara/pull/1331.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1331/head:pull/1331

PR: https://git.openjdk.java.net/skara/pull/1331