Fix importing tuples from JSON

[jeskew]

Resolves #13724

This PR applies the sealed modifier to types loaded from ARM JSON only if additionalProperties was set to false in the source.

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 8474150717)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 8474150717

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 8474150717"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 8474150717

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 8474150717"

[github-actions]

Test Results

    66 files   -     33      66 suites   - 33   21m 57s ⏱️ - 15m 50s
10 722 tests  -     19  10 720 ✅  -     19  2 💤 ±0  0 ❌ ±0 
25 340 runs   - 12 663  25 336 ✅  - 12 661  4 💤  - 2  0 ❌ ±0 

Results for commit 1d0dc60. ± Comparison against base commit 6b0e259.