Deprecate spack bootstrap trust/untrust (#33600)

* Deprecate spack bootstrap trust/untrust
* Update CI
* Update tests

.github/workflows/unit_tests.yaml

@@ -78,7 +78,7 @@ jobs:
           SPACK_PYTHON: python
       run: |
           . share/spack/setup-env.sh
-          spack bootstrap untrust spack-install
+          spack bootstrap disable spack-install
           spack -v solve zlib
     - name: Run unit tests
       env:
@@ -215,7 +215,7 @@ jobs:
         git --version
         . .github/workflows/setup_git.sh
         . share/spack/setup-env.sh
-        $(which spack) bootstrap untrust spack-install
+        $(which spack) bootstrap disable spack-install
         $(which spack) solve zlib
         common_args=(--dist loadfile --tx '4*popen//python=./bin/spack-tmpconfig python -u ./bin/spack python' -x)
         $(which spack) unit-test --cov --cov-config=pyproject.toml "${common_args[@]}"