fix(utxo-staking): update createProofOfPossession method signature

Add channel parameter to match the signature in the parent class. The channel
parameter indicates the context in which the proof of possession is created.

Issue: BTC-2402

Co-authored-by: llm-git <llm-git@ttll.de>

Author: OttoAllmendinger

modules/utxo-staking/src/babylon/stakingManager.ts

@@ -68,11 +68,16 @@ class BitGoStakingManager extends vendor.BabylonBtcStakingManager {
 
   /**
    * Creates a proof of possession for the staker based on ECDSA signature.
+   * @param channel - The channel for which the proof of possession is created.
    * @param bech32Address - The staker's bech32 address on the babylon network.
    * @param stakerBtcAddress
    * @returns The proof of possession.
    */
-  async createProofOfPossession(bech32Address: string, stakerBtcAddress: string): Promise<ProofOfPossessionBTC> {
+  override async createProofOfPossession(
+    channel: 'delegation:create' | 'delegation:register',
+    bech32Address: string,
+    stakerBtcAddress: string
+  ): Promise<ProofOfPossessionBTC> {
     // force the ECDSA signature type
     return this.createProofOfPossessionWithSigType(bech32Address, stakerBtcAddress, BTCSigType.ECDSA);
   }