Python: [BREAKING] Observability updates (#2782)
* fixes Python: Add env_file_path parameter to setup_observability() similar to AzureOpenAIChatClient
Fixes #2186
* WIP on updates using configure_azure_monitor
* improved setup and clarity
* fixed root .env.example
* revert changes
* updated files
* updated sample
* updated zero code
* test fixes and fixed links
* fix devui
* removed planning docs
* added enable method and updated readme and samples
* clarified docstring
* add return annotation
* updated naming
* update capatilized version
* updated readme and some fixes
* updated decorator name inline with the rest
* feedback from comments addressed