fix: relay corrrelation id to end user when backend provides one

[drohit-cb]

What changed? Why?

This PR helps fix a small bug where we were not relaying back backend correlation id to end user as part of the error message

Note To Reviwers

I have couple of more PRs coming in at which point I can bump the version and do a EOD release.

Testing

added unit tests and also tested manually

>> go run examples/ethereum/stake/main.go /Users/rohit/code/cb/staking/.coinbase_cloud_api_key_production.json 0x87Bf57c3d7B211a100ee4d00dee08435130A62fA 405fb602cbd9618681f37d3079bb494e341da80e197c2b9d38bc7ad46f11d04f
2024/09/23 13:09:30 stakeable balance: Balance { amount: '206.5928997' asset: 'Asset { networkId: 'ethereum-holesky' assetId: 'eth' contractAddress: '' decimals: '18' }' }
2024/09/23 13:09:30 error building staking operation: APIError{HttpStatusCode: 400, Code: bad_staking_request, Message: Requested stake amount 999999999999999999970270236377088 wei (ETH) is greater than available wallet balance 206592899679428624384 wei (ETH), CorrelationId: 8c7d2c3cfd845c19-SJC}

Qualified Impact

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1