feat: adapt simple UI testing tool

[l-qing]

1. Adapt fields and methods in go template.
2. Adapt gRPC server configuration to support self-signed certificates.

/kind feature

Changes

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[enarha]

/ok-to-test

[l-qing]

/cc @khrm

[khrm]

Sorry. I didn't notice this. Will review today.

[Copilot]

Pull Request Overview

This PR adapts a simple UI testing tool to work with updated protobuf definitions and adds support for secure gRPC connections using self-signed certificates.

• Updates Go template to use .Data.Type instead of .Data.TypeUrl for protobuf message types
• Simplifies textproto function to use native string representation instead of complex unmarshaling
• Adds configurable gRPC client with TLS certificate support and command-line flags

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tools/simpleui/templates/records.html	Updates template field reference from TypeUrl to Type
tools/simpleui/template.go	Simplifies textproto function and updates imports for new protobuf types
tools/simpleui/main.go	Adds TLS support, command-line flags, and configurable gRPC connection

[Copilot]

The textproto function has been changed from returning (string, error) to just string, removing error handling. This could mask potential issues when converting protobuf Any messages to string representation. Consider maintaining error handling or documenting why errors are no longer possible.