[EngSys] Remove unnecessary pwsh from eng-tools-test (#38930)

Author: mikeharder

.github/workflows/_reusable-eng-tools-test.yaml

@@ -36,7 +36,6 @@ jobs:
     steps:
       - if: runner.os == 'Windows'
         run: git config --global core.longpaths true
-        shell: pwsh
 
       - uses: actions/checkout@v4
         with:
@@ -52,23 +51,19 @@ jobs:
 
       - name: Build
         run: npm run build
-        shell: pwsh
         working-directory: ./eng/tools/${{ inputs.package }}
 
       - name: Lint
         run: npm run lint
         if: inputs.lint == true
-        shell: pwsh
         working-directory: ./eng/tools/${{ inputs.package }}
 
       - name: Check Formatting
         run: npm run format:check:ci
-        shell: pwsh
         working-directory: ./eng/tools/${{ inputs.package }}
 
       - name: Test
         run: npm run test:ci
-        shell: pwsh
         working-directory: ./eng/tools/${{ inputs.package }}
 
       - name: Archive code coverage results