Improve readability of CLI E2E test logging

[StephenWeatherford]

Even when passing these tests look like they're failing:

Changed so that warnings (at least experimental feature warnings) go to console.log instead of console.error.

[github-actions]

Test this change out locally with the following install scripts (Action run 9701319145)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 9701319145

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 9701319145"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 9701319145

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 9701319145"

[github-actions]

Dotnet Test Results

    72 files   -     35      72 suites   - 35   23m 18s ⏱️ - 13m 40s
10 879 tests  -     20  10 878 ✅  -     20  1 💤 ±0  0 ❌ ±0 
25 654 runs   - 12 823  25 652 ✅  - 12 822  2 💤  - 1  0 ❌ ±0 

Results for commit 416be35. ± Comparison against base commit 74dab7a.

♻️ This comment has been updated with latest results.