* chore(cargo): Update dependencies
for xtask subcommand to remove warnings about unknown compiler
attributes.
* deps(xtask): Remove `lazy_static`
as dependency, since the code we need can now be expressed using rusts
`std` builtin types.
* fix(xtask): Hide deprecated args
so the compiler doesn't complain about dead code any more.
* fix(xtask): Remove needless borrow.
* fix: Remove dead code
across the codebase, as discovered by the rust compiler.
* fix(server): Log previously ignored errors.
* fix(xtask): Remove needless `format!` calls.
* fix(xtask): Remove superfluous return statement.
* fix(client): Remove unused enum variant
from `ClientInstruction` and all code attached to it.
* fix(server): Restore functions needed in tests.
* chore: Apply rustfmt.
* fix(server): Add missing code.
* fix: Remove leftover warnings.
* CHANGELOG: Add MR #4026.
* fix(xtask): Pin `xshell` to version 0.2.2
because release 0.2.3 changed the way stdin is handled, breaking
interactive command invocations (such as we use).
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