Auto merge of #116381 - Mark-Simulacrum:drop-wasm32-unknown-emscripten, r=Kobzol

Remove wasm32-unknown-emscripten tests from CI

This builder tested the wasm32-unknown-emscripten target, which is tier 2 (and so not eligible for testing). In the recent beta [promotion](#116362 (comment)), we ran into a problem with this target: emscripten doesn't support passing environment variables into the std environment, so we can't enable RUSTC_BOOTSTRAP for libtest in order to pass -Zunstable-options.

We worked around this for the beta/stable branches, but given this problem, and its tier 2 status, just dropping the target's tests entirely seems warranted. Downgrading to tier 3 may also be a good idea, but that is a separate conversation not proposed here.

Author: bors

.github/workflows/ci.yml

@@ -266,9 +266,6 @@ jobs:
           - name: test-various
             os: ubuntu-20.04-8core-32gb
             env: {}
-          - name: wasm32
-            os: ubuntu-20.04-8core-32gb
-            env: {}
           - name: x86_64-gnu
             os: ubuntu-20.04-4core-16gb
             env: {}

src/ci/docker/host-x86_64/wasm32/Dockerfile

@@ -429,9 +429,6 @@ jobs:
           - name: test-various
             <<: *job-linux-8c
 
-          - name: wasm32
-            <<: *job-linux-8c
-
           - name: x86_64-gnu
             <<: *job-linux-4c