[chore] Auto-populate release title

[mowies]

Description

This PR auto populated the release title correctly to the latest doubel-tag (e.g. v1.27.0/v0.121.0)

Link to tracking issue

Follow up to #10191

Testing

Release tested on my fork: https://github.com/mowies/opentelemetry-collector/releases/tag/v0.122.0
Pipeline that filled in the release: https://github.com/mowies/opentelemetry-collector/actions/runs/13920280151/job/38951687724

[mowies]

@evan-bradley this is the follow up to your feedback from yesterday's release :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.63%. Comparing base (e529b31) to head (b9adf1b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12657   +/-   ##
=======================================
  Coverage   91.63%   91.63%           
=======================================
  Files         479      479           
  Lines       26423    26423           
=======================================
  Hits        24214    24214           
  Misses       1749     1749           
  Partials      460      460           

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