chore: fastify example standard fetch

[jasonkuhrt]

Simplify the Fastify example by using standard fetch. Benefits:

1. Tests check for the standard error type that is thrown in case of triggered abort controller.
2. Fewer dependencies
3. Avoid ipv6 bug

Following this change, I will update the other examples too.

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Apollo Federation Subgraph Compatibility Results

Federation 1 Support	Federation 2 Support
_service 🟢 @key (single) 🟢 @key (multi) 🟢 @key (composite) 🟢 repeatable @key 🟢 @requires 🟢 @provides 🟢 federated tracing 🟢	@link 🟢 @shareable 🟢 @tag 🟢 @override 🟢 @inaccessible 🟢 @composeDirective 🟢 @interfaceObject 🟢

Learn more:

• Apollo Federation Subgraph Specification
• Compatibility Tests

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💻 Website Preview

The latest changes are available as preview in: https://81b5cacb.graphql-yoga.pages.dev

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✅ Benchmark Results

     ✓ no_errors{mode:graphql}
     ✓ expected_result{mode:graphql}
     ✓ no_errors{mode:graphql-jit}
     ✓ expected_result{mode:graphql-jit}
     ✓ no_errors{mode:graphql-response-cache}
     ✓ expected_result{mode:graphql-response-cache}
     ✓ no_errors{mode:graphql-no-parse-validate-cache}
     ✓ expected_result{mode:graphql-no-parse-validate-cache}
     ✓ no_errors{mode:uws}
     ✓ expected_result{mode:uws}

     checks.......................................: 100.00% ✓ 506380      ✗ 0     
     data_received................................: 2.1 GB  14 MB/s
     data_sent....................................: 102 MB  678 kB/s
     http_req_blocked.............................: avg=1.57µs   min=972ns    med=1.36µs   max=282.35µs p(90)=2.08µs   p(95)=2.3µs   
     http_req_connecting..........................: avg=2ns      min=0s       med=0s       max=144.71µs p(90)=0s       p(95)=0s      
     http_req_duration............................: avg=371.28µs min=224.08µs med=338.01µs max=15.26ms  p(90)=479.04µs p(95)=502.36µs
       { expected_response:true }.................: avg=371.28µs min=224.08µs med=338.01µs max=15.26ms  p(90)=479.04µs p(95)=502.36µs
     ✓ { mode:graphql-jit }.......................: avg=297.46µs min=224.08µs med=279.57µs max=15.26ms  p(90)=311.77µs p(95)=329.18µs
     ✓ { mode:graphql-no-parse-validate-cache }...: avg=505.58µs min=420.8µs  med=478.9µs  max=6.5ms    p(90)=521.25µs p(95)=564.56µs
     ✓ { mode:graphql-response-cache }............: avg=352.37µs min=270.23µs med=334.21µs max=6.47ms   p(90)=365.86µs p(95)=378.2µs 
     ✓ { mode:graphql }...........................: avg=380.12µs min=282.06µs med=349.67µs max=15.05ms  p(90)=416.5µs  p(95)=483.96µs
     ✓ { mode:uws }...............................: avg=357.49µs min=277.48µs med=337.75µs max=6.82ms   p(90)=375.06µs p(95)=399.18µs
     http_req_failed..............................: 0.00%   ✓ 0           ✗ 253190
     http_req_receiving...........................: avg=34.04µs  min=16.85µs  med=33.6µs   max=3.05ms   p(90)=40.27µs  p(95)=43.66µs 
     http_req_sending.............................: avg=8.92µs   min=5.96µs   med=7.92µs   max=465.56µs p(90)=11.37µs  p(95)=12.69µs 
     http_req_tls_handshaking.....................: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting.............................: avg=328.3µs  min=189.67µs med=296.17µs max=15.11ms  p(90)=435.66µs p(95)=457.26µs
     http_reqs....................................: 253190  1687.919312/s
     iteration_duration...........................: avg=587.41µs min=403.33µs med=549.96µs max=15.86ms  p(90)=697.16µs p(95)=725.37µs
     iterations...................................: 253190  1687.919312/s
     vus..........................................: 1       min=1         max=1   
     vus_max......................................: 2       min=2         max=2   

[ardatan]

I think it is good to use @whatwg-node/fetch.
Thanks to catching this IPV6 bug here, we could fix the issue in whatwg-node/fetch which helped our other tools using @whatwg-node/fetch
Even if this is not a test for whatwg-node/fetch, it is still valuable to use it in our tests.

Also ipv6 is reproduced here during the lockfile upgrade, and fixed after bumping to the patch version;
https://github.com/dotansimha/graphql-yoga/actions/runs/12264473643/job/34218403800

[jasonkuhrt]

@ardatan Good to note that tradeoff!

[ardatan]

This diff looks weird 🤔