Prepare release v1.26.0

[joe-elliott]

Update changelog and package.json for 1.26.0.

[codecov]

Codecov Report

Merging #975 (238de02) into main (5ed7c77) will decrease coverage by 0.10%.
The diff coverage is n/a.

❗ Current head 238de02 differs from pull request most recent head d8c2f20. Consider uploading reports for the commit d8c2f20 to get more accurate results

@@            Coverage Diff             @@
##             main     #975      +/-   ##
==========================================
- Coverage   95.45%   95.35%   -0.11%     
==========================================
  Files         242      242              
  Lines        7555     7555              
  Branches     1890     1890              
==========================================
- Hits         7212     7204       -8     
- Misses        336      344       +8     
  Partials        7        7              

Impacted Files	Coverage Δ
...mponents/TracePage/TraceStatistics/tableValues.tsx	94.48% <0.00%> (-3.45%)	⬇️
...nents/TracePage/TraceTimelineViewer/SpanBarRow.tsx	100.00% <0.00%> (+5.55%)	⬆️

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