install: Use systemd-repart for partitioning #7015

Job	Run time
docs	4m 29s
validate	14m 57s
compute-ci-level	2s
cargo-deny	24s
package (centos-10)	25m 13s
Test install	1h 3m 13s
test-upgrade (centos-10, composefs)	18m 5s
test-container-export	15m 42s
test-upgrade (centos-10, ostree)	17m 40s
test-baseconfigs (centos-10, var-volatile)	12m 15s
test-integration (centos-10, composefs, xfs, grub, bls, unsealed)	2h 22m 10s
test-baseconfigs (centos-10, root-transient)	12m 17s
test-integration (centos-10, composefs, xfs, systemd, bls, unsealed)	2h 10m 30s
test-integration (centos-10, composefs, ext4, systemd, uki, sealed)	1h 18m 52s
test-baseconfigs (centos-10, etc-transient)	13m 31s
test-integration (centos-10, composefs, ext4, grub, bls, unsealed)	2h 33m 52s
test-integration (centos-10, composefs, ext4, systemd, bls, unsealed)	2h 16m 23s
test-integration (centos-10, ostree, xfs, grub, bls, unsealed)	2h 57m 27s
test-integration (centos-10, composefs, xfs, systemd, uki, unsealed)	2h 20m 0s
test-coreos	-1s
required-checks	2s
required-checks-merge	0s
	19h 17m 3s

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