Both TenantByIdKeyFormatter and TenantBySlugKeyFormatter previously
shared the same "cache:invalidate:tenant" channel, causing parse
failures when the slug formatter received bare id payloads (and vice
versa). Split into "cache:invalidate:tenant:id" and
"cache:invalidate:tenant:slug" so each formatter only receives
payloads it can parse.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>