Add pichlermarc to approvers

[dyladan]

Marc has done exceptional work on OTel JS and has been very helpful during the push to release metrics.

[codecov]

Codecov Report

Merging #2960 (ccf012c) into main (1ee1b28) will increase coverage by 1.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2960      +/-   ##
==========================================
+ Coverage   91.56%   92.78%   +1.22%     
==========================================
  Files         176      183       +7     
  Lines        5439     5921     +482     
  Branches     1169     1257      +88     
==========================================
+ Hits         4980     5494     +514     
+ Misses        459      427      -32     

Impacted Files	Coverage Δ
...mentation-xml-http-request/src/enums/EventNames.ts	100.00% <0.00%> (ø)
...-instrumentation-fetch/src/enums/AttributeNames.ts	100.00% <0.00%> (ø)
...es/opentelemetry-context-zone-peer-dep/src/util.ts	100.00% <0.00%> (ø)
...ation-xml-http-request/src/enums/AttributeNames.ts	100.00% <0.00%> (ø)
...ry-context-zone-peer-dep/src/ZoneContextManager.ts	85.18% <0.00%> (ø)
...emetry-instrumentation-xml-http-request/src/xhr.ts	97.63% <0.00%> (ø)
...s/opentelemetry-instrumentation-fetch/src/fetch.ts	96.53% <0.00%> (ø)
...lemetry-resources/src/detectors/ProcessDetector.ts	100.00% <0.00%> (+4.54%)	⬆️
packages/opentelemetry-sdk-trace-web/src/utils.ts	95.00% <0.00%> (+29.37%)	⬆️
...lemetry-resources/src/detectors/BrowserDetector.ts	100.00% <0.00%> (+46.66%)	⬆️

[legendecas]

+1 🎉