Centralize imported symbol to ARM expression conversion

[jeskew]

Resolves #12396

This PR updates the TemplateWriter and ExpressionConverter to handle imported symbols as they're being compiled to ARM expressions. Previously, imported symbols were replaced with an ExpressionRewriteVisitor at earlier stages of processing, but there are some top-level resource properties that are not captured in the IR and thus wouldn't get replaced.

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 6850503183)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 6850503183

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 6850503183"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 6850503183

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 6850503183"

[github-actions]

Test Results

     132 files  ±0       132 suites  ±0   4h 43m 39s ⏱️ - 25m 45s
10 692 tests +1  10 692 ✔️ +1  0 💤 ±0  0 ❌ ±0 
51 663 runs  +4  51 663 ✔️ +4  0 💤 ±0  0 ❌ ±0 

Results for commit d85934a. ± Comparison against base commit 7079cea.

♻️ This comment has been updated with latest results.