Remove Pyrmont testnet (#2543)

## Issue Addressed

N/A

## Proposed Changes

Removes all configurations and hard-coded rules related to the deprecated Pyrmont testnet.

## Additional Info

Pyrmont is deprecated/will be shut down after being used for scenario testing, this PR removes configurations related to it.

Co-authored-by: Zachinquarantine <zachinquarantine@yahoo.com>

testing/web3signer_tests/src/lib.rs

@@ -566,16 +566,6 @@ mod tests {
         test_altair_types("mainnet", 4243).await
     }
 
-    #[tokio::test]
-    async fn pyrmont_base_types() {
-        test_base_types("pyrmont", 4244).await
-    }
-
-    #[tokio::test]
-    async fn pyrmont_altair_types() {
-        test_altair_types("pyrmont", 4245).await
-    }
-
     #[tokio::test]
     async fn prater_base_types() {
         test_base_types("prater", 4246).await