Add AL-Go for GitHub CI/CD and automated tests

[GmsoftLtd]

Adds AL-Go for GitHub (Microsoft's official BC DevOps framework) and an automated test app.

What changed

• Restructured into the AL-Go layout: the main app now lives under ValueEntryAudit/ (required — AL-Go discovers apps in subfolders).
• AL-Go workflows added under .github/workflows (CI/CD, PR handler, release, etc.) plus .AL-Go/settings.json.
• New test app ValueEntryAudit.Test/ with unit/integration tests for the audit calculation (Value Entry Audit Mgt.):
  • expected accounts resolve from the posting setup (purchase → Direct Cost Applied, sale → COGS),
  • mismatch flagged when expected accounts are not posted,
  • no mismatch when posted G/L accounts equal the expected accounts.
• internalsVisibleTo grants the test app access to the internal codeunit.
• .gitignore extended with AL-Go build artifacts.

Verification

• Main app compiles locally (alc) after the move: 0 errors / 0 warnings.
• The test app + tests are built and executed by the AL-Go CI on this PR.

The CI run on this PR validates the build and runs the tests.