feat(env): add powershell format to env --format

[jongio]

What

Adds a powershell output format to azd app env --format.

azd app env --format powershell | Invoke-Expression

Emits one $env:KEY = 'value' line per variable, sorted by key. Values are wrapped in single quotes and embedded single quotes are doubled, so a PowerShell string literal stays literal and there is nothing to interpolate or eval unexpectedly. Works with --all (each service still grouped under its # <service> header) and with --json untouched.

Why

The existing shell format produces export KEY="value" lines that only work in bash-like shells. Windows developers running the CLI in PowerShell had no one-liner to load a service's resolved environment into their session. This fills that gap and matches how the other formats already work.

Changes

• New powershell value for --format, wired through resolveEnvFormat and the formatEnv renderer.
• powerShellQuoteSingle helper for single-quote escaping.
• Flag help, command examples, and doc comments updated to list the new format.
• Tests: powershell cases in TestResolveEnvFormat and TestFormatEnv, plus a new TestPowerShellQuoteSingle covering plain, empty, spaced, quote-bearing, and $-bearing values.

Closes #524

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.78%. Comparing base (37e07e7) to head (f6a5411).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #526      +/-   ##
==========================================
+ Coverage   60.77%   60.78%   +0.01%     
==========================================
  Files         223      223              
  Lines       28527    28536       +9     
==========================================
+ Hits        17337    17346       +9     
  Misses      10010    10010              
  Partials     1180     1180              

Flag	Coverage Δ
unittests	60.78% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
cli/src/cmd/app/commands/env.go	83.07% <100.00%> (+0.48%)	⬆️

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[github-actions]

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One-Line Install (Recommended)

PowerShell (Windows):

iex "& { $(irm https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/install-pr.ps1) } -PrNumber 526 -Version 0.19.5-pr526"

Bash (macOS/Linux):

curl -fsSL https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/install-pr.sh | bash -s 526 0.19.5-pr526

Uninstall

When you're done testing:

PowerShell (Windows):

iex "& { $(irm https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/uninstall-pr.ps1) } -PrNumber 526"

Bash (macOS/Linux):

curl -fsSL https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/uninstall-pr.sh | bash -s 526

---

Build Info:

• Version: 0.19.5-pr526
• Commit: f6a5411
• Release: View pre-release

What to Test:
Please review the PR description and test the changes described there.