docs(instrumentation-fastify): deprecate instrumentation in favor of @fastify/otel#2651

pichlermarc merged 6 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-js-contrib:mainfrom

dynatrace-oss-contrib:chore/deprecate-fastifydynatrace-oss-contrib/opentelemetry-js-contrib:chore/deprecate-fastifyCopy head branch name to clipboard