Deduplicate CoinGecko Ethereum metrics fetch#18822
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Description
Combines the hourly Ethereum price and market cap requests into a single CoinGecko /simple/price call, reducing concurrent API usage and the likelihood of 429 rate-limit errors.
The combined response is stored under the existing price and market cap keys, so getters and consumers remain unchanged. The Demo API key is also moved from the query string to the official x-cg-demo-api-key header.
Adds tests covering the combined response mapping, optional 24-hour change, and invalid responses.
Related Issue
Closes #18790