test: un-skip TestRealPasswordResetCleanup scheduler registration test

[mrofreP]

internal/cron/cron_test.go:313 had TestRealPasswordResetCleanup
disabled with t.Skip("Integration test - requires database setup").
The skip was a false negative — the test only exercises the
scheduler's job-registration path (AddPasswordResetCleanupJob +
GetEntries) and never triggers the cron entry, so the nil Querier
held by the reset.TokenManager is never dereferenced. No database is
actually required.

The reset.NewTokenManager and reset.NewCleanupService constructors
are both nil-safe for the code paths this test exercises, so the
existing body works as-is once the unconditional skip is removed.

Refresh the doc comment to explain the scope (registration only,
not execution) so a future reader does not re-add the skip.

[codacy-production]

Up to standards ✅

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