Better example/tutorial detection for analytics

[emilk]

Our tutorials suggest copy-pasting some code to get started with Rerun. Our analytics will then be fooled into thinking this is real user data.

I suggest we add a example- prefix to all our example app_ids, e.g. rr.init("example-dna", …). We then detect examples based on this prefix.

There is a risk users will just copy-paste the rr.init lint into their own production code, but we will soon show the app id in the viewer (#2938), so my guess is they will notice it pretty quickly and change it.

[nikolausWest]

I suggest we go with something even more obvious and human readable to make it more readable like rr.init("Rerun Usage Example: DNA", ...). It's a bit embarrassing to have your internal demo titled "Rerun Usage Example". It really makes it look like you just copy pasted code =)

[emilk]

rr.init("I am a lazy ape copy-pasting an official Rerun example: DNA", …)