Update Send Slack notification step to send a custom message

.github/workflows/get-go-versions.yml

@@ -50,12 +50,11 @@ jobs:
       - name: Send Slack notification
         run: |
           $pipelineUrl = "$env:GITHUB_SERVER_URL/$env:GITHUB_REPOSITORY/actions/runs/$env:GITHUB_RUN_ID"
+          $message = "The following versions of '${{ env.TOOL_NAME }}' are available to upload: ${{ env.TOOL_VERSIONS }}\nLink to the pipeline: $pipelineUrl"
           ./helpers/get-new-tool-versions/send-slack-notification.ps1 -Url "${{ secrets.SLACK_CHANNEL_URL }}" `
                                                                       -ToolName "${{ env.TOOL_NAME }}" `
-                                                                      -ToolVersion "${{ env.TOOL_VERSIONS }}" `
-                                                                      -PipelineUrl "$pipelineUrl" `
-                                                                      -ImageUrl "https://golang.org/lib/godoc/images/footer-gopher.jpg"
-
+                                                                      -ImageUrl "https://golang.org/lib/godoc/images/footer-gopher.jpg" `
+                                                                      -Text "$message"
   trigger_builds:
     name: Trigger builds
     runs-on: ubuntu-latest
@@ -90,8 +89,8 @@ jobs:
       - name: Send Slack notification if build fails
         run: |
           $pipelineUrl = "$env:GITHUB_SERVER_URL/$env:GITHUB_REPOSITORY/actions/runs/$env:GITHUB_RUN_ID"
-          $Message = "The build of the '${{ env.TOOL_NAME }}' detection pipeline failed :progress-error:\nLink to the pipeline: $pipelineUrl"
+          $message = "The build of the '${{ env.TOOL_NAME }}' detection pipeline failed :progress-error:\nLink to the pipeline: $pipelineUrl"
           ./helpers/get-new-tool-versions/send-slack-notification.ps1 -Url "${{ secrets.SLACK_CHANNEL_URL }}" `
                                                                       -ToolName "${{ env.TOOL_NAME }}" `
-                                                                      -Text "$Message" `
+                                                                      -Text "$message" `
                                                                       -ImageUrl "https://golang.org/lib/godoc/images/footer-gopher.jpg"