Log hash of app file content on instance startup

[mhoeger]

We should be logging a hash of the app file content on startup to be able to definitively tell if app content has changed. This would be very helpful for detectors when non-traditional deployment methods are used. Ideally logged in metrics table

I thought this work was accounted for somewhere but I couldn't find the issue!

[jviau]

I believe this will be covered by our OTel work (#9273). Particularly the "Resource" concept in OTel, which will include information about the application payload being ran.