Migrate client subscription-transport-ws to graphql-ws

[hyochan]

Specify project

client

Description

Migrate client subscription-transport-ws to graphql-ws.
Follow up from #557

Related Issues

N/A

Tests

To not fail

Checklist

Before you create this PR confirms that it meets all requirements listed below by checking the relevant checkboxes ([x]). This will ensure a smooth and quick review process.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the [CLA].
• Run yarn lint && yarn tsc
• Run yarn test or yarn test -u if you need to update snapshot.
• I am willing to follow-up on review comments in a timely manner.

[codecov]

Codecov Report

Merging #558 (5930d63) into main (a7bca73) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 5930d63 differs from pull request most recent head 274ddd5. Consider uploading reports for the commit 274ddd5 to get more accurate results

@@           Coverage Diff           @@
##             main     #558   +/-   ##
=======================================
  Coverage   71.58%   71.58%           
=======================================
  Files          65       65           
  Lines        1309     1309           
  Branches      161      161           
=======================================
  Hits          937      937           
  Misses        346      346           
  Partials       26       26           

Flag	Coverage Δ
unittests	71.58% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/tests/testUtils.ts	100.00% <100.00%> (ø)

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