chore: update Datadog to otel 0.26

[gruebel]

Fixes #118

Changes

• updated Datadog to use OTel 0.26
• changed version management of OTel dependencies to workspace

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.6%. Comparing base (56a6f45) to head (effe240).
Report is 36 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #120     +/-   ##
=======================================
+ Coverage   52.3%   58.6%   +6.3%     
=======================================
  Files         38      39      +1     
  Lines       4967    5774    +807     
=======================================
+ Hits        2598    3387    +789     
- Misses      2369    2387     +18     

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[lalitb]

Thanks.

[gliderkite]

Hi, any idea when the new version of the crate will be published, so that we can update all the opentelemetry dependencies together with datadog? Thanks!