fix: decorator manager singleton

[czy88840616]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[gitpod-io]

[codecov-commenter]

Codecov Report

Merging #1211 (30c6491) into 2.x (c982a10) will increase coverage by 0.07%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##              2.x    #1211      +/-   ##
==========================================
+ Coverage   85.20%   85.27%   +0.07%     
==========================================
  Files         232      236       +4     
  Lines        9024     9157     +133     
  Branches     1710     1735      +25     
==========================================
+ Hits         7689     7809     +120     
- Misses       1268     1281      +13     
  Partials       67       67              

Impacted Files	Coverage Δ
packages/decorator/src/common/decoratorManager.ts	95.09% <50.00%> (-0.32%)	⬇️
packages/ws/src/framework.ts	92.30% <100.00%> (ø)
packages-serverless/serverless-app/src/platform.ts	100.00% <0.00%> (ø)
...erverless/serverless-vercel-starter/src/runtime.ts	87.50% <0.00%> (ø)
...s-serverless/serverless-vercel-trigger/src/http.ts	95.65% <0.00%> (ø)
...-serverless/serverless-vercel-starter/src/index.ts	91.66% <0.00%> (ø)
...-serverless/serverless-vercel-trigger/src/index.ts	100.00% <0.00%> (ø)

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