fix: Remove span-trace-propagation redirect (#16795)

Remove the redirect from `/sdk/telemetry/spans/span-trace-propagation/`
to `/sdk/foundations/trace-propagation/#continue-trace` as the page now
exists at its original path.

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

Author: stephanie-anderson

redirects.js

@@ -555,10 +555,6 @@ const developerDocsRedirects = [
     source: '/sdk/telemetry/traces/trace-propagation-cheat-sheet/',
     destination: '/sdk/foundations/trace-propagation/#propagation-decision-matrix',
   },
-  {
-    source: '/sdk/telemetry/spans/span-trace-propagation/',
-    destination: '/sdk/foundations/trace-propagation/#continue-trace',
-  },
   {
     source: '/sdk/expected-features/setup-wizards/:path*',
     destination: '/sdk-setup-wizards/:path*',