fix!: mark jobs as skipped instead of removing them

[nrdxp]

This allows a situation where a job is required for a PR merge to still pass if they are skipped as per the documentation here: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks

BREAKING CHANGE: a new job conditional will be required

if: matrix.target.skipped == true

Otherwise the job will still run. This allows GitHub to properly update the status of the job without actually having to run it.

Draft Context

Unfortunately this doesn't work as is, but I have requested upstream the possibility of making the matrix context available in an if block: https://github.com/orgs/community/discussions/37883#discussioncomment-7052195