Convert GitHub Actions workflow shell steps to PowerShell for Windows runner

[Copilot]

The workflow was changed to run on windows-latest but shell steps still used bash syntax, causing compatibility issues.

Changes:

• Apply very special configuration: Changed from sed to PowerShell Get-Content with -replace operator
• Build project: Converted bash if [ ... ]; then ... fi to PowerShell if (...) { ... } syntax
• Copy web.config to dist: Changed from cp to PowerShell Copy-Item cmdlet
• All shell steps now explicitly specify shell: pwsh

Before:

- name: Apply very special configuration
  shell: bash
  run: |
    sed -i 's/build --configuration production/build --configuration production --base-href=\/angular-demos-dv\//g' package.json

After:

- name: Apply very special configuration
  shell: pwsh
  run: |
    ((Get-Content -Path package.json -Raw) -replace 'build --configuration production','build --configuration production --base-href=/angular-demos-dv/') | Set-Content -Path package.json

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