Remove experimental flag for JSONRPC command group

[anthony-c-martin]

Partial work towards #14242

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 9727329339)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 9727329339

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 9727329339"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 9727329339

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 9727329339"

[github-actions]

Dotnet Test Results

    72 files   -     36      72 suites   - 36   23m 26s ⏱️ - 8m 51s
10 891 tests  -     20  10 890 ✅  -     20  1 💤 ±0  0 ❌ ±0 
25 678 runs   - 12 835  25 676 ✅  - 12 834  2 💤  - 1  0 ❌ ±0 

Results for commit f81951c. ± Comparison against base commit 57823a8.

♻️ This comment has been updated with latest results.