feat(tools): add readonly `tools.table.EMPTY` for common usage #15470

Job	Run time
Metadata	4s
Build & Package - ubuntu-22.04	5m 54s
Verify Manifest - Package ubuntu-22.04	17s
Build Images - ubuntu	39s
Scan Images - ubuntu	1m 8s
Verify Manifest - Image ubuntu	25s
Release Images - ubuntu - 3.8.0 (pre-release)	13s
Release Packages - ${{ matrix.label }} - ${{ needs.metadata.outputs.release-desc }}	0s
	8m 40s

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