test(server): recreate compiler before each test

[ylemkimon]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

N/A

Motivation / Use-Case

This is cherry-picked from #3039. As the dev-server will become a plugin (#3251), it'd imply one instance per one compiler, so #3039 wouldn't be necessary.

This PR only fixes the relevant test cases, reusing the compiler across multiple server instances.

Breaking Changes

N/A

Additional Info

Closes #3033 and closes #3039.

[alexander-akait]

github actions incident https://www.githubstatus.com/

[codecov]

Codecov Report

Merging #3314 (1d0a3b6) into master (3359732) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3314   +/-   ##
=======================================
  Coverage   95.56%   95.56%           
=======================================
  Files          34       34           
  Lines        1262     1262           
  Branches      358      358           
=======================================
  Hits         1206     1206           
  Misses         52       52           
  Partials        4        4           

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