Fix Network graph links.

What does this MR do?

Fixes the Network graph links so they no longer link to /master#{escape_javascript(@commit_url)}

Are there points in the code the reviewer needs to double check?

Don't think so.

Why was this MR needed?

Single quotes don't evaluate Ruby expressions.

What are the relevant issue numbers?

Fixes #18894 (closed).

cc: @jschatz1