Update HostedAgents samples to Azure.AI.AgentServer.AgentFramework 1.0.0-beta.9 and MEAI 10.3.0

[Copilot]

Motivation and Context

Align all HostedAgents samples to Azure.AI.AgentServer.AgentFramework 1.0.0-beta.9 and Microsoft.Extensions.AI.OpenAI 10.3.0. Several samples were pinned to older beta versions (beta.5, beta.6, beta.8) and preview MEAI builds.

Description

Azure.AI.AgentServer.AgentFramework → 1.0.0-beta.9 across all 6 samples:

• AgentWithTools, AgentWithLocalTools, AgentThreadAndHITL (from beta.8)
• AgentWithHostedMCP (from beta.6)
• AgentWithTextSearchRag, AgentsInWorkflows (from beta.5)

Microsoft.Extensions.AI.OpenAI → 10.3.0 in 3 samples that were on older previews:

• AgentThreadAndHITL (from 10.1.1-preview.1.25612.2)
• AgentWithTextSearchRag (from 10.1.1-preview.1.25612.2)
• AgentsInWorkflows (from 10.1.0-preview.1.25608.1)

The remaining 3 samples (AgentWithTools, AgentWithHostedMCP, AgentWithLocalTools) were already on MEAI 10.3.0.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

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