Merge pull request #19391 from poettering/dissect-grow

optionally, grow file systems to partition size when mounting them via GPT auto-discovery

diff --cc TODO
Simple merge

diff --cc src/dissect/dissect.c
Simple merge

diff --cc src/firstboot/firstboot.c
Simple merge

diff --cc src/nspawn/nspawn.c
Simple merge

diff --cc src/shared/dissect-image.c
Simple merge

diff --cc src/sysusers/sysusers.c
Simple merge

diff --cc test/units/testsuite-50.sh
Simple merge