CI: warn if the size of a binary increases by more than X %

[sylvestre]

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Currently, we only look at build size after the PR ( https://github.com/uutils/coreutils-tracking#binary-size-evolution )

We should monitor this in the CI. For this, we should update: https://github.com/uutils/coreutils/blob/main/.github/workflows/CICD.yml#L529-L536=

And keep track of the individual size of the binary ( like https://github.com/uutils/coreutils-tracking/blob/main/gnu-full-result.json ) and compare if this is significantly increase (ex: > 5%) and trigger a warning.