Remove highlight line comments when copying to clipboard

[jgarrow]

This PR runs the code string through a .replace to remove all of the // highlight-line, // highlight-start, and // highlight-end comments when clicking the copy to clipboard button.

e.g.

    const {ApolloServer, gql} = require('apollo-server');
    const {readFileSync} = require('fs');
    const {buildSubgraphSchema} = require('@apollo/subgraph'); // highlight-line

when copied should only output:

    const {ApolloServer, gql} = require('apollo-server');
    const {readFileSync} = require('fs');
    const {buildSubgraphSchema} = require('@apollo/subgraph');

TODO

• Cut new release of chakra-helpers package once changes are approved

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[BlenderDude]

LGTM 🎉