add interpreter node attribute and info

[dldrk]

Adds a winrm-interpreter node attribute so the interpreter config (which Python binary/path to invoke) can be overridden per node, matching the pattern already used for authtype, winrmtransport, certpath, etc. Fixes rundeckpro#1452.

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Maintainer notes:

• Merged current main into this branch and resolved a conflict in plugin.yaml (the interpreter description text collided with feat: allow defining arbitrary python interpreter for newer distros #108's change of the default to python3).
• The node-attribute override is only wired up for the two node-executing providers (NodeExecutor, FileCopier) — the WorkflowStep provider (WinRMCheck) takes hostname as a plain argument rather than running against a Rundeck-managed node, so a per-node override doesn't apply there. Corrected that provider's description text, which had been updated to claim node-level override support it doesn't actually have.
• Verified locally (CI does not run on this PR): ./gradlew build passes and the full unit test suite (26 tests) passes.

[dldrk]

fixes https://github.com/rundeckpro/rundeckpro/issues/1452

[Copilot]

Pull request overview

This PR updates the Rundeck plugin metadata to expose the Python interpreter setting as a node-level override, making it possible to select a different interpreter per target node without changing the plugin instance configuration.

Changes:

• Expands the interpreter config description to mention the node attribute override key (winrm-interpreter).
• Adds renderingOptions.instance-scope-node-attribute: winrm-interpreter and groups the setting under an “Interpreter” UI group for both the NodeExecutor and FileCopier providers.