Tooltip should default to commit author not committer

[martincostello]

When tooltips for the commit data are rendered, they give the name of the user who committed the commit.

github-action-benchmark/src/default_index_html.ts

Line 217 in fe4e90e

return '\n' + data.commit.message + '\n\n' + data.commit.timestamp + ' committed by @' + data.commit.committer.username + '\n';

This is not always useful, as merge and squash commits are committed by web-flow. The author is a better value to use.

I've used the template index to write my own UI, so it's easy to change with custom code, but I think it makes sense to render the default built-in pages that way too.

- return '\n' + data.commit.message + '\n\n' + data.commit.timestamp + ' committed by @' + data.commit.committer.username + '\n';
+ return '\n' + data.commit.message + '\n\n' + data.commit.timestamp + ' committed by @' + data.commit.author.username + '\n';