build: setup ts/scss/watch

[yufeih]

#8281

[codecov]

Codecov Report

Base: 77.16% // Head: 77.15% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (b33b71f) compared to base (16a1ff2).
Patch has no changes to coverable lines.

❗ Current head b33b71f differs from pull request most recent head 65bf333. Consider uploading reports for the commit 65bf333 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8421      +/-   ##
==========================================
- Coverage   77.16%   77.15%   -0.01%     
==========================================
  Files         859      859              
  Lines       30701    30701              
==========================================
- Hits        23690    23688       -2     
- Misses       7011     7013       +2     

Impacted Files	Coverage Δ
...osoft.DocAsCode.Tests.Common/TestLoggerListener.cs	92.45% <0.00%> (-1.89%)	⬇️
src/Microsoft.DocAsCode.Common/Git/GitUtility.cs	74.46% <0.00%> (-0.54%)	⬇️

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