[Fix] OPENAPI_SHA check (#3935)

## Changes
<!-- Summary of your changes that are easy to understand -->
This PR checks if the openapi_sha is equal with the one used in
databricks-sdk-go dependency.

## Tests
<!-- 
How is this tested? Please see the checklist below and also describe any
other relevant tests
-->

- [ ] `make test` run locally
- [ ] relevant change in `docs/` folder
- [ ] covered with integration tests in `internal/acceptance`
- [ ] relevant acceptance tests are passing
- [ ] using Go SDK

Author: parthban-db

.github/workflows/validate-sha.yml

@@ -0,0 +1,24 @@
+name: Validate openapi sha
+
+on:
+  pull_request:
+    types: [opened, synchronize, edited]
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Validate SHA
+        run: |
+          Version=$(go list -m -json github.com/databricks/databricks-sdk-go | jq -r ".Version")
+          OPENAPI_SHA_GO_SDK=$(curl https://raw.githubusercontent.com/databricks/databricks-sdk-go/$Version/.codegen/_openapi_sha)
+          OPENAPI_SHA=$(cat .codegen/_openapi_sha)
+          if [ "$OPENAPI_SHA_GO_SDK" != "$OPENAPI_SHA" ]; then
+            echo "OpenAPI SHA mismatch"
+            exit 1
+          else 
+            echo "OpenAPI SHA match"
+          fi