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vinyl: check if fiber is cancelled after tasks completion

`sql-tap/intpkey.test` start to flak under load after the commit
fe769b0a0325 ("vinyl: add graceful shutdown"). The issue is
vy_scheduler_complete_tasks() may yield. So on shutdown
`vinyl.scheduler` fiber may be cancelled during this yield and then we
go to sleep waiting for new tasks forever. Now vinyl shutdown hangs.

Part of #8423

NO_TEST=fix flaky test
NO_CHANGELOG=fix flaky test
NO_DOC=fix flaky test

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