opentelemetry-api: update EnvironmentGetter to ignore non-normalized environment variable names#5289
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…etry#5144) Fixes open-telemetry#5143 Prototypes: - open-telemetry/opentelemetry-go-contrib#9112 - open-telemetry/opentelemetry-cpp#4141 - open-telemetry/opentelemetry-java#8474 - open-telemetry/opentelemetry-js#6774 - open-telemetry/opentelemetry-python#5289 - open-telemetry/opentelemetry-swift-core#83 ### Rationale The previous wording required environment variable carriers to normalize every key present in the carrier before matching a requested propagation key. This PR removes that requirement for two reasons: - **Efficiency**: extraction should not require reading every environment variable - **Determinism**: if multiple environment variable names normalize to the same key, selecting one is ambiguous and implementation-dependent. Instead, carriers normalize the key requested by the propagator and read only the corresponding normalized environment variable name. `Keys` similarly returns only environment variable names that are already normalized. This keeps injection behavior unchanged while making extraction predictable and avoiding unnecessary environment enumeration.
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Follows open-telemetry/opentelemetry-specification#5144