Allow importing from Bicep templates with required parameters

[jeskew]

Resolves #13997
Resolves #14069

This PR updates the ParameterAssignmentEvaluator to only evaluate the portions of imported templates that are used. This will allow imports from Bicep templates that have required parameters, which is not supported today.

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 9039758150)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 9039758150

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 9039758150"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 9039758150

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 9039758150"

[github-actions]

Dotnet Test Results

    66 files   -     33      66 suites   - 33   23m 18s ⏱️ - 8m 22s
10 887 tests  -     18  10 886 ✅  -     18  1 💤 ±0  0 ❌ ±0 
25 670 runs   - 12 825  25 668 ✅  - 12 824  2 💤  - 1  0 ❌ ±0 

Results for commit 2cab358. ± Comparison against base commit 68462f0.

[majastrz]