fix(spec+compiler): update MCP gateway OTLP headers to string-only (v1.13.0) (#25135)

* fix(spec): update MCP gateway spec OTLP headers to string-only

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* fix(compiler): emit OTLP headers as string, remove JSON object conversion

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* Add changeset

* bump: MCP Gateway version to v0.2.17 and recompile workflows

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* merge: main and recompile all 186 workflows

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* fix(mcp_renderer): JSON-escape OTLP headers and add gateway OTLP unit test

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* fix(mcp_renderer): remove JSON escaping, pass OTLP headers as-is

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* chore: merge main and recompile 187 workflows

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* fix: revert gateway version to v0.2.16 (v0.2.17 not released yet)

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Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
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Author: 3 people