[release/6.0] Increment source generator assembly versions with every build (#58919)

[release/6.0] Increment source generator assembly versions with every build (#58919)

* increment source generator assembly versions with every build

* use isGenerator Project property

* add comment

* Replacement tokens in logging test baseline files (#58220)

* Replacement tokens in logging test baseline files

Instead of using a hardcoded version of the assembly version
on the logging generated baseline files used by tests we use
replacement tokens and at runtime we replace them.

fixes #58175

Co-authored-by: Anirudh Agnihotry <anagniho@microsoft.com>
Co-authored-by: Allan Targino <13934447+allantargino@users.noreply.github.com>