Release PerfMetricsBinding to avoid memory leak (#53420)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/53420

# Changelog: [Internal]

HostRuntimeBinding owns a connection, which is stored as a session on HostTarget, so we need to release it first in order to satifsy the assertion in the destructor.

Reviewed By: huntie

Differential Revision: D80778273

fbshipit-source-id: be7bf085fadd8808fd5e5c621c3990a5e7e0186d