Replace bans delete_message_days with delete_message_seconds #5844

Job	Run time
Test (stable)	2m 29s
Test (macOS)	1m 16s
Test (nightly)	1m 41s
Test (beta)	2m 16s
Test (Windows)	5m 27s
Test (native-tls)	2m 31s
Build docs	36s
Test (no default features)	55s
Check minimal versions	31s
Test (no cache)	2m 20s
Test (no gateway)	1m 43s
MSRV	0s
Test (unstable Discord API features)	2m 45s
Examples	2m 31s
Test (zlib compression)	2m 32s
Test (zstd compression)	2m 23s
Test (zlib and zstd compression)	2m 33s
Test (chrono, chrono)	59s
Test (unstable API + typesize, default unstable typesize, true)	1m 5s
Test (builder without model, builder, true)	36s
Test (unstable Discord API (no default features), unstable, true)	32s
	37m 41s

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