fix(ci): pin azldev to specific commit SHA, drop schema freshness check

Agent-Logs-Url: https://github.com/microsoft/azurelinux/sessions/75a06ec4-d5d0-455d-84f8-cef9e06cf6d8

Co-authored-by: christopherco <35273088+christopherco@users.noreply.github.com>

Author: Copilot

.github/workflows/lint.yaml

@@ -30,16 +30,8 @@ jobs:
           cache: false
 
       - name: Install azldev
-        run: go install github.com/microsoft/azure-linux-dev-tools/cmd/azldev@main
+        run: go install github.com/microsoft/azure-linux-dev-tools/cmd/azldev@0590d38b32c0a414e0969e85aca8542c3d339079
 
       - name: "Validate config (strict)"
         run: azldev config dump -q > /dev/null
-
-      - name: "Check schema freshness"
-        run: |
-          azldev config generate-schema > /tmp/azldev.schema.json
-          if ! diff -u external/schemas/azldev.schema.json /tmp/azldev.schema.json; then
-            echo "::error::Checked-in schema is out of date. Run: azldev config generate-schema > external/schemas/azldev.schema.json"
-            exit 1
-          fi