testing: set up nightly run that runs fuzz tests

[RaduBerinde]

We have a couple of tests that use Go fuzzing infrastructure:

pkg/storage/engine_key_test.go
338:func FuzzEngineKeysInvariants(f *testing.F) {

pkg/sql/sqlliveness/slstorage/sessionid_test.go
25:func FuzzSessionIDEncoding(f *testing.F) {

Fuzz tests only do something more interesting than regular tests when the -fuzz flag is used. We should set up a nightly run that does this.

Jira issue: CRDB-31052

[blathers-crl]

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[rafiss]

we've added a fuzz test in #105654 also.