fix(sdk-trace-web): propagate optimised flag in getElementXPath recursion

[akkupratap323]

Summary

• keep the optimised flag when recursing in getElementXPath
• use ancestor id values to shorten XPath results when available
• add a regression test for the ancestor-id optimization case

Background

getElementXPath currently forces optimised=false in the recursive call.
That discards ancestor IDs and yields verbose XPaths such as //html/body/div
instead of the expected //*[@id="body-id"]/div.

Fix

Propagate the optimised argument through recursion so the algorithm can
short-circuit to an ancestor id as intended.

Verification

• npm test -- packages/opentelemetry-sdk-trace-web/test/window/utils.test.ts

Issue

Fixes #6323

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: akkupratap323 / name: Aditya Pratap Singh (3760ad2, 4005d1c)
• ✅ login: pichlermarc / name: Marc Pichler (3b70d86, 9b631b3)

[pichlermarc]

@akkupratap323, are you still working on this? If yes, please address the remaining comments so we can proceed. 🙂

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.68%. Comparing base (2ca8ae1) to head (3b70d86).
⚠️ Report is 55 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6335      +/-   ##
==========================================
+ Coverage   95.58%   95.68%   +0.09%     
==========================================
  Files         314      364      +50     
  Lines        9590    11775    +2185     
  Branches     2221     2742     +521     
==========================================
+ Hits         9167    11267    +2100     
- Misses        423      508      +85     

Files with missing lines	Coverage Δ
packages/opentelemetry-sdk-trace-web/src/utils.ts	93.75% <100.00%> (ø)

... and 88 files with indirect coverage changes

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[otelbot]

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