fix(federation): filter errors as \null\ while projecting the entity for the key

[ardatan]

Filter errors as null in the projected key

If the key field has Error, do not send them to the subgraphs as objects but null.

[changeset-bot]

🦋 Changeset detected

Latest commit: 5fbdb80

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/federation	Patch
federation-benchmark	Patch

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[theguild-bot]

🚀 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/federation	2.2.8-alpha-20240814104345-5fbdb80780d753a50e7b266319bfb789e298f7a8	npm ↗︎ unpkg ↗︎

[github-actions]

✅ Benchmark Results

     ✓ no_errors
     ✓ expected_result

     checks.........................: 100.00% ✓ 334       ✗ 0  
     data_received..................: 39 MB   3.9 MB/s
     data_sent......................: 143 kB  14 kB/s
     http_req_blocked...............: avg=4.44µs   min=2.07µs  med=2.66µs   max=254.65µs p(90)=3.88µs   p(95)=4.12µs  
     http_req_connecting............: avg=760ns    min=0s      med=0s       max=126.93µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=55.35ms  min=47.58ms med=50.96ms  max=158.14ms p(90)=64.06ms  p(95)=87.32ms 
       { expected_response:true }...: avg=55.35ms  min=47.58ms med=50.96ms  max=158.14ms p(90)=64.06ms  p(95)=87.32ms 
     http_req_failed................: 0.00%   ✓ 0         ✗ 167
     http_req_receiving.............: avg=128.22µs min=95.36µs med=124.89µs max=301.25µs p(90)=141.45µs p(95)=157.83µs
     http_req_sending...............: avg=29.1µs   min=18.93µs med=24.75µs  max=570.03µs p(90)=29.89µs  p(95)=34.86µs 
     http_req_tls_handshaking.......: avg=0s       min=0s      med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=55.19ms  min=47.45ms med=50.82ms  max=157.61ms p(90)=63.93ms  p(95)=87.17ms 
     http_reqs......................: 167     16.640064/s
     iteration_duration.............: avg=60.06ms  min=51.74ms med=55.76ms  max=162.1ms  p(90)=71.95ms  p(95)=90.92ms 
     iterations.....................: 167     16.640064/s
     vus............................: 1       min=1       max=1
     vus_max........................: 1       min=1       max=1

[github-actions]

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