[OTLP EXPORTER] fix OTLP recordable attribute spec compliance#4166

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dbarker:fix_otlp_attribute_spec_compliance

Commits on Jun 16, 2026

ensure unique keys for otlp attributes, always allow bytes values in otlp attribute AnyValue types. Use a variant vistor instead of sequential if/else conditions to set otlp attributes. Populate ot…
dbarker
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fix ci issues
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Commits on Jun 18, 2026

use unordered map to track otlp recordable attributes. check for null/empty keys and add test.
dbarker
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