Regression fix to avoid further beta backports: Remove unsound TrustedRandomAccess implementations
Removes the implementations that depend on the user-definable trait `Copy`.
Only fix regressions to ensure merge in 1.55: Does not modify `vec::IntoIter`.
<hr>
This PR applies the beta-`1.53` backport #86222 (merged as part of #86225), a reduced version of #85874 that only fixes regressions, to `master` in order to avoid the need for further backports from `1.55` onwards. Beta-`1.54` backport already happened with #87136. In case that #85874 gets merged quickly (within a week), this PR would be unnecessary.
r? `@cuviper`
aece3df81e