Merge pull request #20109 from keszybz/timestamp-macros

Add macros that define scratch buffer internally for timestamp/timespan formatting

diff --cc src/basic/efivars.c
Simple merge

diff --cc src/core/execute.c
Simple merge

diff --cc src/core/service.c
Simple merge

diff --cc src/core/swap.c
Simple merge

diff --cc src/libsystemd-network/sd-dhcp-client.c
Simple merge

diff --cc src/network/networkd-dhcp6.c
Simple merge

diff --cc src/network/networkd-route.c
Simple merge

diff --cc src/shared/format-table.c
Simple merge

diff --cc src/systemctl/systemctl-show.c
Simple merge

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