fix(url-loader): use multipart/mixed in accept if operationAst has defer or stream directives

[ardatan]

No description provided.

[vercel]

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Name	Status	Preview	Updated
graphql-tools	✅ Ready (Inspect)	Visit Preview	Aug 15, 2022 at 9:13AM (UTC)

[changeset-bot]

🦋 Changeset detected

Latest commit: 285fb6f

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

This PR includes changesets to release 2 packages

Name	Type
@graphql-tools/url-loader	Patch
@graphql-tools/prisma-loader	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/prisma-loader	7.2.14-alpha-20220815091027-af688a61	npm ↗︎ unpkg ↗︎
@graphql-tools/url-loader	7.13.9-alpha-20220815091027-af688a61	npm ↗︎ unpkg ↗︎

[github-actions]

✅ Benchmark Results

     ✓ no_errors
     ✓ expected_result

     checks.........................: 100.00% ✓ 226       ✗ 0  
     data_received..................: 26 MB   2.6 MB/s
     data_sent......................: 97 kB   9.6 kB/s
     http_req_blocked...............: avg=5.76µs   min=2.7µs   med=3.8µs   max=215.5µs  p(90)=4.5µs   p(95)=5.23µs  
     http_req_connecting............: avg=1.37µs   min=0s      med=0s      max=155.6µs  p(90)=0s      p(95)=0s      
   ✓ http_req_duration..............: avg=82.94ms  min=72.55ms med=78.76ms max=168.4ms  p(90)=86.42ms p(95)=130.31ms
       { expected_response:true }...: avg=82.94ms  min=72.55ms med=78.76ms max=168.4ms  p(90)=86.42ms p(95)=130.31ms
     http_req_failed................: 0.00%   ✓ 0         ✗ 113
     http_req_receiving.............: avg=197.39µs min=156.3µs med=183.7µs max=838.9µs  p(90)=203.5µs p(95)=222.78µs
     http_req_sending...............: avg=146.88µs min=19.8µs  med=30.9µs  max=4.35ms   p(90)=42.28µs p(95)=91.46µs 
     http_req_tls_handshaking.......: avg=0s       min=0s      med=0s      max=0s       p(90)=0s      p(95)=0s      
     http_req_waiting...............: avg=82.6ms   min=72.35ms med=78.44ms max=167.49ms p(90)=86.21ms p(95)=130.09ms
     http_reqs......................: 113     11.244972/s
     iteration_duration.............: avg=88.89ms  min=77.99ms med=84.47ms max=173.48ms p(90)=94.1ms  p(95)=135.23ms
     iterations.....................: 113     11.244972/s
     vus............................: 1       min=1       max=1
     vus_max........................: 1       min=1       max=1