refactor: add plugin improvement

[yuqizhou77]

• several improvement and telemetry fix for add plugin

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.61%. Comparing base (fe75f00) to head (cabb7c0).
Report is 6 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #12324   +/-   ##
=======================================
  Coverage   89.60%   89.61%           
=======================================
  Files         582      582           
  Lines       34406    34418   +12     
  Branches     6748     6819   +71     
=======================================
+ Hits        30831    30844   +13     
  Misses       1586     1586           
+ Partials     1989     1988    -1     

Files with missing lines	Coverage Δ
packages/cli/src/userInteraction.ts	82.50% <ø> (-0.07%)	⬇️
...es/fx-core/src/component/utils/envFunctionUtils.ts	92.63% <100.00%> (ø)
packages/fx-core/src/core/FxCore.ts	89.82% <100.00%> (ø)
...extension/src/telemetry/vscodeTelemetryReporter.ts	60.25% <100.00%> (+0.51%)	⬆️

... and 6 files with indirect coverage changes