[ci] [R-package] fix clang 15 warning about unqualified calls (fixes #5661)

[jameslamb]

Fixes #5661.

• uses std::move() explicitly instead of a using declaration, to satisfy clang's -Wunqualified-std-cast-call warning
• upgrades to clang 15 in the r-devel-debian-clang job, to more closely match CRAN's environment (see Inconsistencies with CRAN fedora-clang-devel  r-hub/rhub-linux-builders#63 (comment))

Notes for Reviewers

The installation commands I'm proposing are based on https://apt.llvm.org/llvm.sh, the installation script recommended at https://apt.llvm.org/.

I think copying that stuff in here is safer than downloading a script from the internet and running it on every run.

[jameslamb]

🎉 adding clang-15 to the CI job, I was able to exactly replicate the issue reported on CRAN.

https://github.com/microsoft/LightGBM/actions/runs/3842093698/jobs/6543052842

I'll continue by pushing a fix to LightGBM here. Now we'll have high confidence that if that job passes here, it'll pass on CRAN too.

[jameslamb]

/gha run r-valgrind

Workflow R valgrind tests has been triggered! 🚀
https://github.com/microsoft/LightGBM/actions/runs/3843870737

Status: success ✔️.

[shiyu1994]

LGTM. Thanks for the fix.

[jameslamb]

Thanks @shiyu1994 ! I'll open a PR for a v3.3.5 release tonight.

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