Merge branch 'gdemay/XC-49-fix-label-clash' into 'master'

fix(ckerc20): fix label clash in metrics

(XC-49): Fix a bug introduced in [MR-19112](https://gitlab.com/dfinity-lab/public/ic/-/merge_requests/19112), where the `token` label used for the metric `cketh_minter_erc20_balances` collides with the scrapping job for the minter. 

See merge request dfinity-lab/public/ic!19150

rs/ethereum/cketh/minter/src/main.rs

@@ -864,8 +864,8 @@ fn http_request(req: HttpRequest) -> HttpResponse {
                     "Known amount of ERC-20 on the minter's address",
                 )?;
                 for (token, balance) in s.erc20_balances_by_token_symbol().iter() {
-                    erc20_balances =
-                        erc20_balances.value(&[("token", &token.to_string())], balance.as_f64())?;
+                    erc20_balances = erc20_balances
+                        .value(&[("erc20_token", &token.to_string())], balance.as_f64())?;
                 }
                 w.encode_gauge(
                     "cketh_minter_total_effective_tx_fees",