chore: Add config files symlink step to plugin extension setup script

[tustanivsky]

This PR updates the script that automates console plugin extension setup for the sample app - platform-specific configs can now be stored in their corresponding private repos and symlinked during script invocation.

#skip-changelog

[sentry]

Bug: Script init-console-ext.ps1 symlinks platform config files to sample/Platforms/[Platform]/Config/, but Unreal Engine expects them in sample/Config/[Platform]/.
_{Severity: CRITICAL | Confidence: 1.00}

🔍 Detailed Analysis

The init-console-ext.ps1 script creates symlinks for platform-specific configuration files in sample/Platforms/[Platform]/Config/ (e.g., sample/Platforms/Switch/Config/SwitchEngine.ini). However, Unreal Engine expects these files to be located in sample/Config/[Platform]/ (e.g., sample/Config/Switch/SwitchEngine.ini). As a result, Unreal Engine will not load the symlinked platform-specific configurations, silently falling back to default settings, which can lead to incorrect runtime behavior for platform-specific features.

💡 Suggested Fix

Modify scripts/init-console-ext.ps1 to create symlinks for platform-specific config files in sample/Config/[Platform]/ instead of sample/Platforms/[Platform]/Config/ to align with Unreal Engine's configuration loading hierarchy.

🤖 Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: scripts/init-console-ext.ps1#L213-L218

Potential issue: The `init-console-ext.ps1` script creates symlinks for
platform-specific configuration files in `sample/Platforms/[Platform]/Config/` (e.g.,
`sample/Platforms/Switch/Config/SwitchEngine.ini`). However, Unreal Engine expects these
files to be located in `sample/Config/[Platform]/` (e.g.,
`sample/Config/Switch/SwitchEngine.ini`). As a result, Unreal Engine will not load the
symlinked platform-specific configurations, silently falling back to default settings,
which can lead to incorrect runtime behavior for platform-specific features.

_{Did we get this right? 👍 / 👎 to inform future reviews.}