Add run command for transforms with variable prompting

[Copilot]

Adds ability to execute Jinja2 and Python transforms directly from the VSCode extension with interactive parameter prompting.

Implementation

• Command: infrahub.runTransform appears as run button on transform items in YAML tree view
• Flow: Prompts for branch selection → iterative variable entry in key=value format → spawns terminal executing infrahubctl transform <name> [variables] --branch <branch>
• Validation: Accepts variables with = in values (e.g., password=abc=def), rejects malformed input, handles cancellation

Changes

• package.json: Command definition and context menu binding for viewItem =~ /transforms/
• commands.ts: runTransformCommand() implementation with variable prompting loop
• infrahubYamlTreeViewProvider.ts: Sets contextValue = 'transforms' on transform items
• extension.ts: Command registration

Terminal reuses existing runInfrahubctlInTerminal() pattern with environment variable inheritance for authentication.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add run command for transforms</issue_title>
<issue_description>Add run command for transforms that spawns a terminal and prompts for params. For jinja and python

Params can be found here: https://docs.infrahub.app/infrahubctl/infrahubctl-transform</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add run command for transforms #30

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