Auto merge of #86670 - Aaron1011:copy-variance-diag, r=davidtwco
Auto merge of #86670 - Aaron1011:copy-variance-diag, r=davidtwco

Derive `Copy` for `VarianceDiagInfo`

aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust