[WIP] Add setting to auto reveal open files in PR changes view

[Copilot]

Plan: Add Auto-Reveal Setting for PR Changes View

Based on the issue and code analysis, I need to:

• Add new setting githubPullRequests.fileAutoReveal to package.json configuration (default: true)
• Add localization strings for the new setting to package.nls.json
• Add setting key constant to src/common/settingKeys.ts
• Update src/view/treeNodes/repositoryChangesNode.ts to use the new setting instead of explorer.autoReveal
• Test the functionality to ensure files are auto-revealed when the setting is enabled
• Verify the setting can be toggled on/off

Current Status: The auto-reveal functionality already exists in the codebase (repositoryChangesNode.ts lines 53-66), but it currently uses VS Code's explorer.autoReveal setting. Need to add a dedicated extension setting with default value true.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Follow open files in the PR changes view</issue_title>
<issue_description>Requested by @digitarald:

When a file that's in the currently checked out PR is opened (even when it's not a diff) we should highlight the file in the "Changes" view if it's open.
</issue_description>

<agent_instructions>Add a setting for auto reveal. Default to true.</agent_instructions>

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

@alexr00 We already do this. @alexr00 Here's what I see:

Can you share a gif of what you're seeing?</comment_new>

• Fixes Follow open files in the PR changes view #4521

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