[REFACTOR] Don't hard code model names

[FokkoVeegens]

Ensure these data are removed here and retrieved from their primary store (whichever that is):

github-copilot-token-usage/src/extension.ts

Lines 2292 to 2314 in f49e955

	private getModelFromRequest(request: any): string {
	// Try to determine model from request metadata
	if (request.result && request.result.metadata && request.result.metadata.modelId) {
	return request.result.metadata.modelId;
	}
	if (request.result && request.result.details) {
	if (request.result.details.includes('Claude Sonnet 3.5')) { return 'claude-sonnet-3.5'; }
	if (request.result.details.includes('Claude Sonnet 3.7')) { return 'claude-sonnet-3.7'; }
	if (request.result.details.includes('Claude Sonnet 4')) { return 'claude-sonnet-4'; }
	if (request.result.details.includes('Gemini 2.5 Pro')) { return 'gemini-2.5-pro'; }
	if (request.result.details.includes('Gemini 3 Pro (Preview)')) { return 'gemini-3-pro-preview'; }
	if (request.result.details.includes('Gemini 3 Pro')) { return 'gemini-3-pro'; }
	if (request.result.details.includes('GPT-4.1')) { return 'gpt-4.1'; }
	if (request.result.details.includes('GPT-4o-mini')) { return 'gpt-4o-mini'; }
	if (request.result.details.includes('GPT-4o')) { return 'gpt-4o'; }
	if (request.result.details.includes('GPT-4')) { return 'gpt-4'; }
	if (request.result.details.includes('GPT-5')) { return 'gpt-5'; }
	if (request.result.details.includes('GPT-3.5-Turbo')) { return 'gpt-3.5-turbo'; }
	if (request.result.details.includes('o3-mini')) { return 'o3-mini'; }
	if (request.result.details.includes('o4-mini')) { return 'o4-mini'; }
	}
	return 'gpt-4'; // default
	}

If the data are stored, it would be here: https://github.com/rajbos/github-copilot-token-usage/blob/main/src/modelPricing.json

I prefer to store the model ID and not the name.

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