fix(executor): handle thrown values that are not error instances correctly

[ardatan]

Fixes #6039

[changeset-bot]

🦋 Changeset detected

Latest commit: 8c6f0fe

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@graphql-tools/executor	Patch

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[github-actions]

🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
@graphql-tools/executor	1.2.6-alpha-20240408110006-8c6f0fea3b2f1f9b128b7f1a818146b437244455	npm ↗︎ unpkg ↗︎

[github-actions]

✅ Benchmark Results

     ✓ no_errors
     ✓ expected_result

     checks.........................: 100.00% ✓ 350       ✗ 0  
     data_received..................: 41 MB   4.1 MB/s
     data_sent......................: 150 kB  15 kB/s
     http_req_blocked...............: avg=3.88µs   min=1.77µs  med=2.46µs   max=216.4µs  p(90)=3.47µs  p(95)=3.72µs  
     http_req_connecting............: avg=756ns    min=0s      med=0s       max=132.46µs p(90)=0s      p(95)=0s      
     http_req_duration..............: avg=52.96ms  min=45.84ms med=49.09ms  max=134.56ms p(90)=57.83ms p(95)=86.79ms 
       { expected_response:true }...: avg=52.96ms  min=45.84ms med=49.09ms  max=134.56ms p(90)=57.83ms p(95)=86.79ms 
     http_req_failed................: 0.00%   ✓ 0         ✗ 175
     http_req_receiving.............: avg=133.93µs min=107.3µs med=128.35µs max=415.04µs p(90)=145.3µs p(95)=156.67µs
     http_req_sending...............: avg=24.05µs  min=16.56µs med=23.77µs  max=62.51µs  p(90)=28.18µs p(95)=33.16µs 
     http_req_tls_handshaking.......: avg=0s       min=0s      med=0s       max=0s       p(90)=0s      p(95)=0s      
     http_req_waiting...............: avg=52.8ms   min=45.68ms med=48.94ms  max=134.15ms p(90)=57.67ms p(95)=86.63ms 
     http_reqs......................: 175     17.481876/s
     iteration_duration.............: avg=57.18ms  min=49.36ms med=53.27ms  max=138.36ms p(90)=63.08ms p(95)=90.58ms 
     iterations.....................: 175     17.481876/s
     vus............................: 1       min=1       max=1
     vus_max........................: 1       min=1       max=1

[github-actions]

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