Add explicit checking of text output

Currently if tests don't fail, we print out the text output in the CI pipeline. If there is a change, it must be manually checked and is sometimes missed.

Instead, we should have parallel tests that compute the text output and check them against fixed templates of text. These templates could and should be updated when we make textual changes. These templates could also make it easy to make a diff between different versions of ligo-followup-advocate and clearly show what changes were made.