Remove `@apollo/gateway` reference

[ardatan]

We don't use @apollo/gateway or the Envelop plugin anymore.

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: fce9efdac61b3a31418c50ef74eb1cff307bb3b6

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### 💻 Website Preview The latest changes are available as preview in: [https://5d2d1ec6.graphql-yoga.pages.dev](https://5d2d1ec6.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}

     checks.......................................: 100.00% ✓ 427130      ✗ 0     
     data_received................................: 1.7 GB  15 MB/s
     data_sent....................................: 86 MB   719 kB/s
     http_req_blocked.............................: avg=1.38µs   min=990ns    med=1.26µs   max=247.21µs p(90)=1.78µs   p(95)=1.98µs  
     http_req_connecting..........................: avg=2ns      min=0s       med=0s       max=154.56µs p(90)=0s       p(95)=0s      
     http_req_duration............................: avg=354.23µs min=206.44µs med=317.74µs max=24.45ms  p(90)=458.06µs p(95)=479.04µs
       { expected_response:true }.................: avg=354.23µs min=206.44µs med=317.74µs max=24.45ms  p(90)=458.06µs p(95)=479.04µs
     ✓ { mode:graphql-jit }.......................: avg=277.4µs  min=206.44µs med=256.5µs  max=18.09ms  p(90)=287.12µs p(95)=299.07µs
     ✓ { mode:graphql-no-parse-validate-cache }...: avg=479.8µs  min=394.75µs med=454.41µs max=9.13ms   p(90)=498.99µs p(95)=529.82µs
     ✓ { mode:graphql-response-cache }............: avg=335.74µs min=269.22µs med=316.79µs max=6.21ms   p(90)=350.5µs  p(95)=361.21µs
     ✓ { mode:graphql }...........................: avg=360.77µs min=269.52µs med=326.34µs max=24.45ms  p(90)=374.93µs p(95)=411.87µs
     http_req_failed..............................: 0.00%   ✓ 0           ✗ 213565
     http_req_receiving...........................: avg=33.06µs  min=16.96µs  med=32.85µs  max=813.2µs  p(90)=38.06µs  p(95)=40.33µs 
     http_req_sending.............................: avg=7.66µs   min=5.78µs   med=6.85µs   max=495.62µs p(90)=10.29µs  p(95)=10.97µs 
     http_req_tls_handshaking.....................: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting.............................: avg=313.5µs  min=180.55µs med=277.91µs max=24.3ms   p(90)=417.03µs p(95)=435.61µs
     http_reqs....................................: 213565  1779.689615/s
     iteration_duration...........................: avg=557.27µs min=382.46µs med=516.12µs max=25.09ms  p(90)=665.7µs  p(95)=692.51µs
     iterations...................................: 213565  1779.689615/s
     vus..........................................: 1       min=1         max=1   
     vus_max......................................: 2       min=2         max=2