fix(example-opencensus-shim): avoid OpenCensus auto instrumentations

[llc1123]

Which problem is this PR solving?

Currently the opencensus-shim example imports @opencensus/nodejs which also imports @opencensus/instrumentation-all and grpc and causes build fails on many platforms.

Short description of the changes

Changed @opencensus/nodejs to @opencensus/nodejs-base which does not include instrumentations.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• Followed the style guidelines of this project

[codecov]

Codecov Report

Merging #3951 (b42680d) into main (a30952c) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head b42680d differs from pull request most recent head 1bc0aa3. Consider uploading reports for the commit 1bc0aa3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3951      +/-   ##
==========================================
+ Coverage   92.91%   92.92%   +0.01%     
==========================================
  Files         297      297              
  Lines        8838     8838              
  Branches     1815     1815              
==========================================
+ Hits         8212     8213       +1     
+ Misses        626      625       -1     

see 1 file with indirect coverage changes

[aabmass]

@llc1123

Currently the opencensus-shim example imports @opencensus/nodejs which also imports @opencensus/instrumentation-all and grpc and causes build fails on many platforms.

How is this causing build failures if it is just an example? The code should not run as part of any build. This PR broke the example, following the instructions it no longer runs.

[aabmass]

Opened a PR to revert. Let's discuss there