[Armbian build PR] - squash some warnings (found during all-artifacts+all-images builds on CI)

squash some warnings (found during all-artifacts+all-images builds on CI)

When building "all" the things, these kind of innofensive WARNs pile up. Clean them up a bit. Raises the estimate of 2000MiB to 2300MiB for CLI images. This was determined empirically.

• binfmts: don't raise warning if qemu-arm failed to load under aarch64 (some are native, some are emulated, all are good)
  • reported by @igorpecovnik on Discord, during massive CI build, when armhf builds landed on arm64 builders
• logging: squash undue warnings rootfs/aptcache
  • rootfs is built with BOARD= so just live with it (idea about this warn was that families might hook rootfs build process)
  • count, instead of du, apt caches. seems some empty dirs are reported as "1Mb" by du?
• host-utils: more logging for when junk is found in image apt caches
• logging: curb some warnings into info's
• rootfs: bump non-desktop tmpfs_estimated_size from 2000mb to 2300mb (determined empirically, after building all images)
• pipeline: gha: fix IMAGES_ONLY_OUTDATED_ARTIFACTS and SKIP_IMAGES by exporting them so Python can see; tune logging

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