* fix: preserve user-defined boundary in multipart/mixed Content-Type header
When users specify a boundary parameter in their Content-Type header for
multipart/mixed requests with TEXT body mode, Bruno now preserves the
user-defined boundary instead of generating a new one.
Fixes: https://github.com/usebruno/bruno/issues/7523
* updated the test to use local server and changed the request method to GET
* fix: handle quoted boundary values in Content-Type header extraction
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Co-authored-by: Chirag Chandrashekhar <cchirag85@gmail.com>
