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 82.78%. Comparing base (3d7b09b) to head (556621f).

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%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #775      +/-   ##
==========================================
- Coverage   83.29%   82.78%   -0.51%     
==========================================
  Files          71       71              
  Lines       10401    10424      +23     
  Branches     1311     1304       -7     
==========================================
- Hits         8664     8630      -34     
- Misses       1698     1756      +58     
+ Partials       39       38       -1     

Flag	Coverage Δ
suite.unit	82.78% <53.48%> (-0.51%)	⬇️

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