Remove actions.preTest in favor of integrationTestProvider

By using ci-mgmt's intended solution for running integration tests in the `provider/`
directory, we get a maintained test script and avoid overloading the `actions.preTest`
hook to run tests.

Related to pulumi/ci-mgmt#1276, pulumi/ci-mgmt#1274 (comment)

.ci-mgmt.yaml

@@ -3,14 +3,10 @@ major-version: 3
 docker: true
 makeTemplate: bridged
 team: ecosystem
-actions:
-  preTest:
-    - name: Run provider tests
-      run: |
-        cd provider && go test -v -json -count=1 -cover -timeout 2h -tags=${{ matrix.language }} -parallel 4 . 2>&1 | tee /tmp/gotest.log | gotestfmt
 pulumiConvert: 1
 registryDocs: true
 plugins:
   - name: terraform
     version: "1.0.16"
     kind: converter
+integrationTestProvider: true

.github/workflows/test.yml

@@ -80,8 +80,9 @@ jobs:
         token: ${{ secrets.GITHUB_TOKEN }}
         version: v2.5.0
     - name: Run provider tests
-      run: |
-        cd provider && go test -v -json -count=1 -cover -timeout 2h -tags=${{ matrix.language }} -parallel 4 . 2>&1 | tee /tmp/gotest.log | gotestfmt
+      if: matrix.testTarget == 'local'
+      working-directory: provider
+      run: go test -v -count=1 -cover -timeout 2h -tags=${{ matrix.language }} -parallel 4 .
     - name: Run tests
       if: matrix.testTarget == 'local'
       run: cd examples && go test -v -count=1 -cover -timeout 2h -tags=${{ matrix.language }} -skip TestPulumiExamples -parallel 4 .