Copilot Code completions should honor instructions configuration

[pladaria]

This was previously reported as a bug
#233391
And closed because it is working "as designed"

I believe that code completions should follow instructions configuration otherwise in some scenarios it will generate code that is not helpful.

For example, in a React Native repository I don't want to generate React for web code (I want View instead of div, Text instead of p, I don't want classnames, etc)