ci: defer the Solaris job until after tier 1

Solaris is a Tier 2 target so defer it until after tier1 completes. We
currently do this for the other T2 targets. In preparation of adding
other VM tests to the matrix, adjust naming.

Additionally, just `set -x` rather than priting the commands before
running them.

(backport <#4124>)
(cherry picked from commit 549eb77)

.github/workflows/ci.yaml

@@ -132,8 +132,9 @@ jobs:
       - name: Execute run-docker.sh
         run: ./ci/run-docker.sh ${{ matrix.target }}
 
-  solaris:
-    name: Solaris
+  test_tier2_vm:
+    name: Test tier2 VM
+    needs: [test_tier1, style_check]
     runs-on: ubuntu-latest
     strategy:
       fail-fast: true
@@ -150,10 +151,9 @@ jobs:
           mem: 4096
           copyback: false
           prepare: |
+            set -x
             source <(curl -s https://raw.githubusercontent.com/psumbera/solaris-rust/refs/heads/main/sh.rust-web-install)
-            echo "~~~~ rustc --version ~~~~"
             rustc --version
-            echo "~~~~ Solaris-version ~~~~"
             uname -a
           run: |
             export PATH=$HOME/.rust_solaris/bin:$PATH
@@ -177,10 +177,10 @@ jobs:
     name: success
     runs-on: ubuntu-22.04
     needs:
+      - style_check
       - test_tier1
       - test_tier2
-      - solaris
-      - style_check
+      - test_tier2_vm
       - verify_build
     # Github branch protection is exceedingly silly and treats "jobs skipped because a dependency
     # failed" as success. So we have to do some contortions to ensure the job fails if any of its