Enhance security of the Complete message for GraphQL over WebSocket protocol

[minwoox]

Motivation:
When constructing the Complete message in the GraphQL over WebSocket Protocol, appending a string directly to the ID can lead to malformed messages if the input is manipulated by the user. This vulnerability could potentially allow users to create arbitrary responses by inputting malformed IDs.

Modification:

• Serialize the Complete message using a map instead of concatenating strings directly.

Result:

• The Complete message in the GraphQL over WebSocket Protocol is now constructed securely.

[github-actions]

🔍 Build Scan® (commit: 73c2c69)

Job name	Status	Build Scan®
build-windows-latest-jdk-19	✅	https://ge.armeria.dev/s/t37a3qpunn5m6
build-self-hosted-unsafe-jdk-8	✅	https://ge.armeria.dev/s/f5iz2ohou6qj6
build-self-hosted-unsafe-jdk-19-snapshot-blockhound	✅	https://ge.armeria.dev/s/j4gncbx2kajii
build-self-hosted-unsafe-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/pbyapgqtpb56o
build-self-hosted-unsafe-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/limkzvf3tdpu6
build-self-hosted-unsafe-jdk-17-leak	✅	https://ge.armeria.dev/s/rv4iub4ojamy4
build-self-hosted-unsafe-jdk-11	✅	https://ge.armeria.dev/s/7y326e7szf5gu
build-macos-12-jdk-19	❌ (failure)	https://ge.armeria.dev/s/antj7xf3wfhwq

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 74.04%. Comparing base (bcca9d3) to head (73c2c69).
Report is 8 commits behind head on main.

Files	Patch %	Lines
...p/armeria/server/graphql/GraphqlWSSubProtocol.java	50.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5531      +/-   ##
============================================
- Coverage     74.04%   74.04%   -0.01%     
+ Complexity    20853    20852       -1     
============================================
  Files          1807     1807              
  Lines         76743    76762      +19     
  Branches       9789     9792       +3     
============================================
+ Hits          56826    56838      +12     
- Misses        15293    15300       +7     
  Partials       4624     4624              

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[jrhee17]

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[ikhoon]

👍👍