When boot counting is enabled, adding a new loader entry or UKI can conflict with an existing one that has booted successfully and therefore has its boot counter removed. systemd-bless-boot will fail to bless the new successful boot, since a file without a boot counter already exists. Since kernel-install will clobber existing files without boot counting, we should therefore remove files without a boot count as well, when we add a file with one. Fixes: #33504
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