[chore] Prepare release v1.26.0/v0.120.0

[opentelemetrybot]

The following commands were run to prepare this release:

• make chlog-update VERSION=v1.26.0/v0.120.0
• make prepare-release PREVIOUS_VERSION=1[.]25[.]0 RELEASE_CANDIDATE=1.26.0 MODSET=stable
• make prepare-release PREVIOUS_VERSION=0[.]119[.]0 RELEASE_CANDIDATE=0.120.0 MODSET=beta

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.55%. Comparing base (4397ebc) to head (6f5ba89).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12412   +/-   ##
=======================================
  Coverage   91.55%   91.55%           
=======================================
  Files         467      467           
  Lines       25652    25652           
=======================================
  Hits        23485    23485           
  Misses       1768     1768           
  Partials      399      399           

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