Bump cloud agent version to 0.0.6

[tushar-signoz]

📄 Summary

This pull request updates the agent configuration handling for cloud integrations, specifically improving how the agent version is managed and exposed. The main changes make the agent version configurable via the API and update the default version used during connection URL generation.

Agent configuration improvements:

• Added a new AgentVersion field to the SigNozAgentConfig struct, allowing the agent version to be specified in API requests.

Connection URL generation changes:

• Updated the default agent version from "v0.0.5" to "v0.0.6" and made it overrideable if AgentVersion is provided in the request, enabling more flexible deployments.

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✅ Changes

• Feature: Brief description
• Bug fix: Brief description

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🔍 Related Issues

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📋 Checklist

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👀 Notes for Reviewers

[Copilot]

Pull Request Overview

This PR updates the cloud integration agent configuration to bump the default agent version from v0.0.5 to v0.0.6 and makes the agent version configurable via API requests.

• Adds a new Version field to the SigNozAgentConfig struct for API-based version specification
• Updates the default agent version from v0.0.5 to v0.0.6 in connection URL generation
• Implements logic to override the default version when provided in API requests

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