Add splunk workspace to commit fd649d1 for backstage 1.36.1 on branch main

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Add splunk workspace at commit backstage/community-plugins@fd649d1 for backstage 1.36.1 on branch main.

This PR was created automatically.
You might need to complete it with additional dynamic plugin export information, like:

• the associated app-config.dynamic.yaml file for frontend plugins,
• optionally the scalprum-config.json file for frontend plugins,
• optionally some overlay source files at the plugin level,
• optionally a patch file at the workspace level

Before merging, you need to export the workspace dynamic plugins as OCI images,
and if possible test them inside a RHDH instance.

To do so, you can use the /publish instruction in a PR review comment.
This will start a PR check workflow to:

• export the workspace plugins as dynamic plugins,
• publish them as OCI images
• push the oci-images in the GitHub container registry with a PR-specific tag.