Clean disk space in conda test pipeline (#7902)

Fixes #7901


### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

Signed-off-by: YunLiu <55491388+KumoLiu@users.noreply.github.com>

.github/workflows/conda.yml

@@ -32,6 +32,10 @@ jobs:
         maximum-size: 16GB
         disk-root: "D:"
     - uses: actions/checkout@v4
+    - name: Clean up disk space
+      run: |
+        find /opt/hostedtoolcache/* -maxdepth 0 ! -name 'Python' -exec rm -rf {} \;
+        rm -rf /usr/share/dotnet/
     - uses: conda-incubator/setup-miniconda@v3
       with:
         auto-update-conda: true