The address sanitizer job is silently failing at the moment because we
do not install clang.
Install clang so the address sanitizer job can run. Do not fix the
silent failure, that will be done later on.
In line with the `Tests` job and for the fact that this job does stuff
with the nightly toolchain other than bench.
Re-name nightly CI job from `bench_nightly`to `Nightly`.
We have unnecessary runs of the `test.sh` script. We can simplify the CI
pipeline and at the same time improve the docs build by using `--cfg
docsrs`.
- Remove the `wasm` job, replace it by enabling the `DO_WASM` env var for
the stable toolchain run in the `Tests` job.
- Add `--cfg docrs` flag to the docs build and set the `DO_DOCS` env var
as part of the nightly toolchain run in `Tests` job.
The end result is one less run of the `test.sh` script and better test
coverage.