Adds better abilities to check, what exactly was rate limited #5825

Job	Run time
Test (nightly)	1m 33s
Test (stable)	2m 36s
Test (macOS)	2m 3s
Test (beta)	2m 14s
Build docs	44s
Test (Windows)	4m 58s
Test (native-tls)	2m 25s
Examples	2m 35s
Test (no default features)	1m 5s
Test (no cache)	2m 23s
Check minimal versions	35s
MSRV	0s
Test (no gateway)	1m 42s
Test (unstable Discord API features)	2m 34s
Test (chrono, chrono)	55s
Test (unstable API + typesize, default unstable typesize, true)	59s
Test (builder without model, builder, true)	35s
Test (unstable Discord API (no default features), unstable, true)	32s
	30m 28s

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