Remove opencensus telemetry

[jenshnielsen]

This has been deprecated for a while so lets get rid of it.

• Document breaking change

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 67.34%. Comparing base (a1ecedc) to head (ac6d9c7).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
src/qcodes/logger/logger.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6439      +/-   ##
==========================================
+ Coverage   67.29%   67.34%   +0.04%     
==========================================
  Files         352      352              
  Lines       32165    32137      -28     
==========================================
- Hits        21647    21644       -3     
+ Misses      10518    10493      -25     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.