Improve rc file detection based on rustup #5026
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Summary
Brings in some learnings from
rustup: https://github.com/rust-lang/rustup/blob/fede22fea7b160868cece632bd213e6d72f8912f/src/cli/self_update/shell.rs#L197.For example: we only need to write to
.zshenv(but we have to respectZDOTDIR). Additionally, for Fish, we need to respectXDG_CONFIG_HOME