fix(stitch): do not remove unmerged fields from both isolated and non-isolated subschemas

[ardatan]

This PR also adds tests if @graphql-tools/federation gives the expected schema as same as supergraph defines.

See the changesets for the changes

[changeset-bot]

🦋 Changeset detected

Latest commit: 552f8ab

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

This PR includes changesets to release 3 packages

Name	Type
@graphql-tools/stitch	Patch
@graphql-tools/utils	Minor
federation-benchmark	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/stitch	9.2.1-alpha-20240429120433-552f8ab685b2c3e3b462ab0ab019f427a5dfed1f	npm ↗︎ unpkg ↗︎
@graphql-tools/utils	10.2.0-alpha-20240429120433-552f8ab685b2c3e3b462ab0ab019f427a5dfed1f	npm ↗︎ unpkg ↗︎

[github-actions]

✅ Benchmark Results

     ✓ no_errors
     ✓ expected_result

     checks.........................: 100.00% ✓ 310       ✗ 0  
     data_received..................: 36 MB   3.6 MB/s
     data_sent......................: 133 kB  13 kB/s
     http_req_blocked...............: avg=4.8µs    min=2.27µs   med=3.27µs   max=206.33µs p(90)=4.63µs   p(95)=5.16µs  
     http_req_connecting............: avg=868ns    min=0s       med=0s       max=134.64µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=60.53ms  min=52.12ms  med=56.67ms  max=149.12ms p(90)=65.65ms  p(95)=92.74ms 
       { expected_response:true }...: avg=60.53ms  min=52.12ms  med=56.67ms  max=149.12ms p(90)=65.65ms  p(95)=92.74ms 
     http_req_failed................: 0.00%   ✓ 0         ✗ 155
     http_req_receiving.............: avg=138.45µs min=110.66µs med=134.66µs max=403.94µs p(90)=155.55µs p(95)=164.62µs
     http_req_sending...............: avg=27.95µs  min=21.48µs  med=27.56µs  max=61.7µs   p(90)=34.01µs  p(95)=36.8µs  
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=60.36ms  min=51.96ms  med=56.51ms  max=148.65ms p(90)=65.47ms  p(95)=92.57ms 
     http_reqs......................: 155     15.453503/s
     iteration_duration.............: avg=64.68ms  min=55.78ms  med=61.08ms  max=154.35ms p(90)=70.51ms  p(95)=96.88ms 
     iterations.....................: 155     15.453503/s
     vus............................: 1       min=1       max=1
     vus_max........................: 1       min=1       max=1

[github-actions]

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