add Open OnDemand external tool manifest for demo

scripts/openondemand/README.md

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+This directory contains external tool manifest files for the integration with Open OnDemand, which is orchestrated with an app called [OnDemand Loop](https://github.com/IQSS/ondemand-loop), which is [described](https://github.com/IQSS/dataverse/pull/11769) in the guides.
+
+Unlike most external tools that launch you right into the tool, this one sends you to a landing page to explain additional requirements (such as being on the VPN) before you continue. We have [created](https://github.com/IQSS/ondemand-loop/issues/334) and [deployed](https://github.com/IQSS/dataverse.harvard.edu/issues/390) a dedicated landing page for the demo server and expect a different one for production (with more Harvard Dataverse branding).

scripts/openondemand/dataverse-manifest-demo.json

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+{
+  "displayName": "Explore in Open OnDemand",
+  "description": "Download dataset files into Open OnDemand and publish back to Dataverse",
+  "toolName": "ondemand_loop_dataset_tool",
+  "scope": "dataset",
+  "types": ["explore"],
+  "toolUrl": "https://hmdc.github.io/fasrc-ondemand-loop/dv_external_tools/demo_landing.html",
+  "httpMethod": "GET",
+  "toolParameters": {
+    "queryParameters": [
+      {"dataverse_url": "{siteUrl}"},
+      {"dataset_id": "{datasetPid}"},
+      {"version": "{datasetVersion}"},
+      {"locale": "{localeCode}"},
+      {"env_cannon_prod": "{localeCode}"}
+    ]
+  }
+}