Disable some incorrect rust-analyzer diagnostics on beta #136236
                
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rust-lang/rust-analyzer#19044 and rust-lang/rust-analyzer#18976 both need backporting, but their diffs don't apply cleanly. So instead I opted for disabling one of the problematic diagnostics as well as unconditionally treating
rustc_deprecated_safe_2024items to be safe for now.r? @cuviper