Deprecate `ContentSafeOptions::show_discriminator` (#3090) #5902

# to view logs

Job	Run time
Build docs	44s
Examples	4m 31s
Test (macOS)	3m 27s
Check minimal versions	37s
MSRV	50s
Test (nightly)	2m 41s
Test (stable)	2m 51s
Test (beta)	2m 46s
Test (Windows)	5m 51s
Test (native-tls)	2m 32s
Test (no default features)	54s
Test (no cache)	2m 40s
Test (no gateway)	1m 56s
Test (unstable Discord API features)	2m 37s
Test (simd-json)	2m 50s
Test (chrono, chrono)	57s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 21s
Test (builder without model, builder, true)	42s
Test (unstable Discord API (no default features), unstable_discord_api, true)	42s
	41m 29s

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