docs: expand Connection Property Suffix migration guidance for Aspire 13.2

[Copilot]

The ### Connection property suffix breaking-change entry in whats-new/aspire-13-2.mdx was a single placeholder sentence with no actionable guidance for users upgrading from 13.1.

Changes

• Expanded the breaking-change section in whats-new/aspire-13-2.mdx to cover microsoft/aspire#13471:
  • Explains why the suffix was added (disambiguates name strings from data objects)
  • Full rename table across all affected resource types:
    • Database → DatabaseName — PostgreSQL, SQL Server, MySQL, MongoDB, Oracle, Milvus, Azure Cosmos DB, Azure PostgreSQL Flexible Server, Azure SQL, Azure Data Explorer
    • Model → ModelName — Azure AI Foundry, Azure OpenAI, OpenAI, GitHub Models
    • ConsumerGroup → ConsumerGroupName — Azure Event Hubs consumer groups
  • Before/after environment variable examples showing the concrete variable name change
  • Numbered migration steps (<Steps>) covering: grep search pattern, updating env var reads in consuming apps, and updating GetConnectionProperty() calls in AppHost code

Before/after snapshot:

# Before (Aspire ≤13.1)
MYDB_DATABASE=customers
CHAT_MODEL=gpt-4o-mini

# After (Aspire 13.2)
MYDB_DATABASENAME=customers
CHAT_MODELNAME=gpt-4o-mini

// AppHost — before
worker.WithEnvironment("DB_NAME", mydb.Resource.GetConnectionProperty("Database"));

// AppHost — after
worker.WithEnvironment("DB_NAME", mydb.Resource.GetConnectionProperty("DatabaseName"));

[Copilot]

Pull request overview

Expands the Aspire 13.2 “Connection property suffix” breaking-change entry to give actionable migration guidance for users whose consuming apps or AppHost code reads connection properties/environment variables directly.

Changes:

• Adds a rename table covering Database→DatabaseName, Model→ModelName, and ConsumerGroup→ConsumerGroupName across multiple resource types.
• Adds before/after environment variable examples to show the concrete injected name changes.
• Adds step-by-step migration instructions, including guidance for updating GetConnectionProperty() calls.

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