feat(ratios): always return 24h change in GetRelative service

[onyb]

Summary

GetRelative appears to be triggering a request to fetch market chart for single coingecko id requests, for a piece of data which doesn't seem to be that useful to Brave Wallet.

We'll now always be copying the 24H % change to <currency>_timeframe_change field, ignoring whatever duration is specified by the caller. In the future, we'll remove duration as a parameter to the corresponding controller since it doesn't make semantic sense to have it.

Related to brave/brave-browser#44557

Type of Change

• Product feature
• Bug fix
• Performance improvement
• Refactor
• Other

Tested Environments

• Development
• Staging
• Production

Before Requesting Review

• Does your code build cleanly without any errors or warnings?
• Have you used auto closing keywords?
• Have you added tests for new functionality?
• Have validated query efficiency for new database queries?
• Have documented new functionality in README or in comments?
• Have you squashed all intermediate commits?
• Is there a clear title that explains what the PR does?
• Have you used intuitive function, variable and other naming?
• Have you requested security and/or privacy review if needed
• Have you performed a self review of this PR?

Manual Test Plan

Ensure hitting the endpoint returns the 24h change regardless of the duration. For example, the following endpoints should have the same result for usd_timeframe_change:

• http://ratios.bsg.brave.com/v2/relative/provider/coingecko/ethereum,neon/usd/live
• http://ratios.bsg.brave.com/v2/relative/provider/coingecko/ethereum,neon/usd/1d
• http://ratios.bsg.brave.com/v2/relative/provider/coingecko/ethereum,neon/usd/1w