Update the 'Apply Security to a Proxy Service' guide with the graphical view of policy files

[gabilang]

Description

$Subject

Currently, graphical view of policy files are not supported in the mi-vscode. This feature is under development and being tracked via https://github.com/wso2/mi-vscode/issues/83. Once this feature is live, the Apply Security to a Proxy Service page needs to be updated with enabling security policies via graphical view contents.

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[rosensilva]

This depends on the proxy service security feature in vs code