[Security] Retire legacy JSON helper codeunits

[Onat Buyukakkus (onbuyuka)]

Why

Codeunits 5459 JSON Management and 1234 Json Text Reader/Writer expose legacy Newtonsoft/.NET-based JSON handling throughout Base Application and dependent apps. This change migrates first-party callers to native AL JSON types and establishes the compatibility lifecycle needed to remove the legacy helpers under CLEAN30.

What changed

• Migrated production, test, and test-library callers to JsonObject, JsonArray, JsonToken, and JsonValue.
• Reworked the System Application Json implementation to use native AL JSON state, parsing, mutation, path selection, cloning, field conversion, and formatting.
• Replaced Power Automate environment-response parsing with native AL JSON and added focused parser coverage.
• Added strict native JSON Buffer parsing while preserving the existing permissive Json.NET-backed ReadFromText and ReadFromBlob APIs as obsolete compatibility surfaces until CLEAN30.
• Preserved the legacy DotNet Variant shape of public Json.GetPropertyValueByName until CLEAN30 and added GetNativePropertyValueByName for native AL values.
• Marked codeunits 5459 and 1234 as pending obsolete and wrapped them with CLEAN30.
• Kept compatibility overloads only for public production APIs and the externally subscribable Workflow event; removed legacy signatures directly from internal and test-only objects.
• Excluded JsonTextReader, JsonTextWriter, JObject, JArray, JToken, JProperty, and JValue aliases from CLEAN30 builds after removing their clean-build consumers.

Compatibility boundary

Normal builds retain public DotNet compatibility surfaces, including the original Json.GetPropertyValueByName and permissive JSON Buffer readers. Their native replacements are available immediately and the legacy procedures are pending obsolete for 30.0. CLEAN30 removes the legacy APIs, the two helper codeunits, their remaining compatibility calls, and the native-replaceable Newtonsoft aliases together.

Newtonsoft remains only for capabilities without a direct native AL replacement:

• XML-to-JSON and JSON-to-XML conversion using Json.NET XmlNodeConverter semantics.
• Business Chart and Generic Chart serialization of CLR chart models.
• Performance Profiler deserialization into the CLR CpuProfile model.

This PR does not change those payload formats or CLR domain models.

Tests

• Expanded System Application Json characterization for invalid input, legacy/native Variant shapes, state independence, clone behavior, property order, field conversions, indentation, BOM, DTD rejection, and XML declaration behavior.
• Added Power Automate environment parsing coverage for provisioning-state casing, defaults, null/missing properties, and malformed responses.
• Expanded JSON Buffer coverage for legacy Json.NET extensions, strict native root objects/arrays/scalars, paths, depth, standard scalar types, BLOB input, long Unicode text, and malformed input.
• Added focused blank-dimension round-trip coverage for Graph complex types.
• Added or updated focused coverage for Pagero file-part errors.
• Migrated affected API, Graph, Power BI, Sustainability, Image Analysis, Hybrid, and localized tests to native JSON types.

Fixes AB#649586

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