Dispose the disposables in a finally block

[akshita31]

Issue: #2400

In dotnetTest file we are not TestMessage listener using a try-finally block due to which when there is an exception, the listener still remains and when the next time the debugger starts, there are multiple listeners which make the logs look very clumsy.

[rchande]

@akshita31 Do we really want the changes made to package-lock.json?

[codecov]

Codecov Report

Merging #2405 into master will decrease coverage by 0.06%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #2405      +/-   ##
=========================================
- Coverage   62.56%   62.5%   -0.07%     
=========================================
  Files          87      87              
  Lines        3876    3880       +4     
  Branches      552     552              
=========================================
  Hits         2425    2425              
- Misses       1287    1291       +4     
  Partials      164     164

Flag	Coverage Δ
#integration	51.65% <0%> (-0.06%)	⬇️
#unit	84.26% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
src/features/dotnetTest.ts	11.32% <0%> (-0.22%)	⬇️

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[rchande]

Approved except for package-lock changes