Make more Result methods const

[netsutetsu]

Tracking issue: #82814

Constified methods: Result::{map, map_or, map_or_else, map_err, as_deref, as_deref_mut, unwrap_or_default, and_then, or_else, unwrap_or_else, unwrap_unchecked, unwrap_err_unchecked, copied, cloned}

[rustbot]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @joshtriplett (or someone else) soon.

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[rustbot]

Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

Examples of T-libs-api changes:

• Stabilizing library features
• Introducing insta-stable changes such as new implementations of existing stable traits on existing stable types
• Introducing new or changing existing unstable library APIs (excluding permanently unstable features / features without a tracking issue)
• Changing public documentation in ways that create new stability guarantees
• Changing observable runtime behavior of library APIs

[netsutetsu]

@rustbot label: +T-libs-api -T-libs +A-const-fn

[Dylan-DPC]

r? @thomcc

[bors]

☔ The latest upstream changes (presumably #114250) made this pull request unmergeable. Please resolve the merge conflicts.

[thomcc]

I think even in our new process an ACP is needed for this? You can file one here https://github.com/rust-lang/libs-team/

[Dylan-DPC]

@netsutetsu any updates on the ACP?

[thomcc]

I'm going to be away for a few months, so I'm rerolling my PRs so that folks don't have to wait for me. Sorry/thanks.

r? libs

[Dylan-DPC]

Closing this as inactive. Feel free to reöpen this pr or create a new pr if you get the time to work on this. Thanks