fix(domain): 清理domain的时候，移除挂载在domain的context

[RobinzZH]

"nodejs里面EventEmitter初始化的时候，都会把当前的domain存下来。然后tsw里面又把整个请求的抓包存在domain.currentContext. 而数据库的PoolConnection类型又是继承EventEmitter的，Connection会一直存在，所以内存里就会一直有最初启动的几条流水线日志抓包。"

[codecov]

Codecov Report

Merging #554 (29f0716) into master (8dcddc7) will increase coverage by 0.46%.
Report is 3 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #554      +/-   ##
==========================================
+ Coverage   90.42%   90.89%   +0.46%     
==========================================
  Files          21       21              
  Lines         679      681       +2     
  Branches      112      119       +7     
==========================================
+ Hits          614      619       +5     
+ Misses         64       61       -3     
  Partials        1        1              

Files Changed	Coverage Δ
lib/core/runtime/create-server.hack.ts	96.72% <100.00%> (+0.05%)	⬆️

... and 2 files with indirect coverage changes

[github-actions]

🎉 This PR is included in version 2.6.6 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀