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Add String() method to telemetry Config to redact OTLP credentials (#3782)

The Config struct's Headers field stores authentication credentials
(API keys, bearer tokens) for OTLP endpoints. Without a String()
method, these values could be exposed if the struct is logged or
printed in error paths.

Add a fmt.Stringer implementation that redacts header values with
[REDACTED] while preserving keys for debuggability.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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