fix: use compressed event size to close chunk #11991

Job	Run time
Rego PR checks	1m 43s
Go Lint	3m 10s
Generate Code	1m 12s
YAML Lint	24s
WASM	10s
Check Generated	33s
Go Build (linux amd64)	2m 40s
Go Test (linux)	5m 0s
Go compat build/test (ubuntu-24.04, 1.21)	3m 26s
Go Build (linux arm64)	2m 13s
Go Test (darwin)	4m 52s
Go compat build/test (macos-14, 1.21)	5m 31s
Go Race Detector	7m 22s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 21s
Go Build (windows amd64)	2m 35s
Go Build (darwin amd64)	1m 20s
Go Build (darwin arm64)	56s
docker image smoke test	35s
smoke-test-binaries (linux, ubuntu-24.04, opa_linux_amd64, amd64)	20s
smoke-test-binaries (linux, ubuntu-24.04, opa_linux_amd64_static, amd64, disabled)	16s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	21s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	11s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	48s
	47m 59s

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