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 55.81395% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.52%. Comparing base (5fc1b13) to head (09909a7).

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	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #775      +/-   ##
==========================================
- Coverage   82.60%   82.52%   -0.09%     
==========================================
  Files          64       64              
  Lines        9465     9488      +23     
  Branches     1106     1109       +3     
==========================================
+ Hits         7819     7830      +11     
- Misses       1612     1624      +12     
  Partials       34       34              

Flag	Coverage Δ
suite.unit	82.52% <55.81%> (-0.09%)	⬇️

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