Log click events on search homepage and repogroup page
Created by: attfarhan
Fixes https://github.com/sourcegraph/sourcegraph/issues/12356.
Adds 3 event to our logging:
-
RepogroupPageRepoLinkClicked
event when clicking on repository links on the repogroup page -
ExampleSearchClicked
when an example search is clicked on the homepage -
ExampleLanguageSearchClicked
when an example language is clicked on the homepage
@ebrodymoore do these names suffice or should they be follow a certain format?