Add configuration validation

[edmocosta]

Prior to this change, the config validation wasn't being performed by the playground, and invalid configurations (values) were run as it's. This PR changed the config parsing logic to also call the xconfmap.Validator.Validate function, making it closer to a real collector and avoiding running config with invalid values.

[Copilot]

Pull request overview

This PR adds configuration validation to the playground by integrating the xconfmap.Validator.Validate function into the config parsing logic, ensuring invalid configurations are caught before execution rather than being run with invalid values.

Changes:

• Extracted common unmarshaling and validation logic into a new unmarshalValidConfig function
• Added validation step that checks if configs implement xconfmap.Validator and calls Validate() if present
• Added comprehensive test coverage with a mock config type to verify validation behavior

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
internal/config.go	Refactored config parsing to extract unmarshalValidConfig function that performs both unmarshaling and validation
internal/config_test.go	Added test cases and mock config type to verify validation logic works for both single and multiple configs
go.mod	Added dependency on go.opentelemetry.io/collector/confmap/xconfmap package
Makefile	Updated Go mod tidy compatibility version from 1.22.0 to 1.24.0

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

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