ci: enable fuzzing for *-full-ci branches

Now it is not possible to run fuzzing on CI without merge to master
branch. Last time we missed [1] a broken compilation on merging new
fuzzers to master [2]. This patch enables fuzzing for branches with
postfix 'full-ci'.

1. https://github.com/tarantool/tarantool/pull/6757
2. https://github.com/tarantool/tarantool/pull/6627