modules: Change CheckReleasable to Releasable

Change RunningRelease.CheckReleasable to just Releasable, which is no
longer returning any stories, it just returns a boolean saying whether
the release is releasable.

Change-Id: dc2ac5775c
Story-Id: SF-78
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Change-Id: 6c32ff21d4
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Change-Id: 738a96b66c
deps: Update gocli to v2 to fix formatting

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Change-Id: 0237d2757d