feat(cli): telemetry sent to endpoint

[kaizencc]

This PR includes the following

• more robust trace messaging for telemetry success / failure
• use of Funnel class to combine FileSink and EndpointSink
• update integ tests to assert on trace messages that the telemetry sent returns 200 OK

The tests work if the endpoint provided is included as an env variable TELEMETRY_ENDPOINT

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov-commenter]

Codecov Report

❌ Patch coverage is 53.48837% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.85%. Comparing base (409f8e7) to head (b45506e).

Files with missing lines	Patch %	Lines
packages/aws-cdk/lib/cli/io-host/cli-io-host.ts	58.82%	14 Missing ⚠️
...es/aws-cdk/lib/cli/telemetry/sink/endpoint-sink.ts	42.85%	4 Missing ⚠️
...ges/aws-cdk/lib/cli/telemetry/collect-telemetry.ts	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #775      +/-   ##
==========================================
- Coverage   81.42%   80.85%   -0.57%     
==========================================
  Files          63       63              
  Lines        8602     8625      +23     
  Branches     1034     1034              
==========================================
- Hits         7004     6974      -30     
- Misses       1567     1617      +50     
- Partials       31       34       +3     

Flag	Coverage Δ
suite.unit	80.85% <53.48%> (-0.57%)	⬇️

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