Switch version from function to string in otellambda

[jongwooo]

Change Version() func to const Version string in otellambda, otellambda/xrayconfig

Part of #8272

[dmathieu]

This needs a changelog entry.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.2%. Comparing base (991be59) to head (5b2cdd3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #8357     +/-   ##
=======================================
- Coverage   82.3%   82.2%   -0.1%     
=======================================
  Files        189     188      -1     
  Lines      13771   13769      -2     
=======================================
- Hits       11336   11323     -13     
- Misses      2030    2041     +11     
  Partials     405     405             

Files with missing lines	Coverage Δ
.../github.com/aws/aws-lambda-go/otellambda/lambda.go	90.2% <100.0%> (ø)

... and 1 file with indirect coverage changes

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[dmathieu]

Please avoid force-pushing PRs. That breaks the GitHub review workflow.