feat: check if the buffer is full before writing to ISB (#2166) #1186

Job	Run time
build-rust-amd64	5m 10s
build-rust-arm64	5m 18s
Build binaries	2m 49s
Build & push linux/amd64 and linux/arm64 (numaflow)	2m 5s
Bom	1m 16s
Release	21s
	16m 59s

Provide feedback