fix: block redirect header leaks#936
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Motivation and Context
This fixes a security issue where the default reqwest-backed streamable HTTP transport could follow redirects while preserving caller-provided custom headers. Disabling automatic redirects keeps secrets such as custom API key headers scoped to the intended MCP server instead of replaying them to an attacker-controlled redirect target.
How Has This Been Tested?
Added a regression test
Breaking Changes
No
Types of changes
Checklist