Add two separate ACR SDK providers behind ORYX_ENABLE_ACR_SDK_PROVIDER:

1. ExternalAcrSdkProvider - communicates with LWASv2 via Unix socket
   to pull SDK images from WAWS Images ACR
2. AcrSdkProvider (direct) - downloads SDKs from Oryx ACR
   (oryxsdks.azurecr.io) using OCI Distribution API

New files:
- IExternalAcrSdkProvider.cs / ExternalAcrSdkProvider.cs
- OciRegistryClient.cs - HTTP client for OCI Distribution API
- AcrVersionProviderBase.cs - base class for ACR version discovery
- Per-platform ACR version providers (Node, Python, PHP, DotNetCore)
- publishSdkImageToAcr.sh / publishSdkToAcr.yml - ACR publish pipeline

Modified files:
- Platform install decisions (NodePlatform, PythonPlatform, PhpPlatform,
  DotNetCorePlatform) with ACR branch before existing DynamicInstall
- Version provider orchestrators with ACR provider chain
- PlatformInstallerBase with GetAcrInstallerScriptSnippet()
- Go startup script generator with ACR download path
- DI registrations for all new providers
- Constants, options, settings keys for ACR configuration

All changes are additive and behind feature flags.
Existing blob storage code paths are completely untouched.

…esolution

Remove ACR repository/tag construction from ExternalAcrSdkProvider.
Now sends only platform, version, and debianFlavor to LWASv2.
LWASv2 resolves the SDK companion image from LinuxAssets and
handles pinning, containerd pull, mount, and extraction.

… OneBranch pipeline)

Remove publishSdkImageToAcr.sh and publishSdkToAcr.yml since SDK images
are now built and pushed using onebranch.pipeline.imagebuildinfo in
the AAPT-Antares-Oryx pipeline, not via custom scripts.

Use the same ACR that AAPT-Antares-Oryx publishes SDK images to.
Updated both C# constant and Go constant.

- SA1204: Move static GetFirstLayerDigest before instance members (OciRegistryClient.cs)
- SA1124: Remove #region/#endregion around OCI JSON models (OciRegistryClient.cs)
- SA1202: Move protected GetAcrInstallerScriptSnippet before private methods (PlatformInstallerBase.cs)
- SA1116/SA1117: Place multi-line parameters each on own line (ExternalAcrSdkProvider.cs)
- SA1515: Add blank line before single-line comment (DotNetCoreAcrVersionProvider.cs)

- SA1204: Move static GetFirstLayerDigest before instance members (OciRegistryClient.cs)
- SA1124: Remove #region/#endregion around OCI JSON models (OciRegistryClient.cs)
- SA1202: Move protected GetAcrInstallerScriptSnippet before private methods (PlatformInstallerBase.cs)
- SA1116/SA1117: Place multi-line parameters each on own line (ExternalAcrSdkProvider.cs)
- SA1515: Add blank line before single-line comment (DotNetCoreAcrVersionProvider.cs)

* fix: Resolve StyleCop analyzer errors in ACR SDK provider files

- SA1204: Move static GetFirstLayerDigest before instance members (OciRegistryClient.cs)
- SA1124: Remove #region/#endregion around OCI JSON models (OciRegistryClient.cs)
- SA1202: Move protected GetAcrInstallerScriptSnippet before private methods (PlatformInstallerBase.cs)
- SA1116/SA1117: Place multi-line parameters each on own line (ExternalAcrSdkProvider.cs)
- SA1515: Add blank line before single-line comment (DotNetCoreAcrVersionProvider.cs)

* fix sdk providers logic

* refactor pythonPlatform

* refctor for dotnet,php and node

---------

Co-authored-by: Sarath chandra Bussa <sbussa@microsoft.com>