remove logs longer than memlogd's max-line-len #2687

Job	Run time
packages (arm64-secure, arm64)	15m 43s
packages (ubuntu-20.04, amd64)	5m 6s
packages (ubuntu-latest, riscv64)	1m 11s
manifest	2m 20s
eve (arm64, kvm)	38m 55s
eve (arm64, xen)	37m 45s
eve (amd64, kvm)	38m 4s
eve (amd64, xen)	35m 35s
eve (riscv64, mini)	2m 18s
trigger_assets	0s
	2h 56m 57s

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