feat: remove unused function AllDeployerKeys (#128)

This function was not used, and it was removed to clean up the codebase.
Users can write their own function to retrieve deployer keys if needed.

Author: jkongie

.changeset/tidy-donuts-learn.md

@@ -0,0 +1,5 @@
+---
+"chainlink-deployments-framework": minor
+---
+
+Remove unused `deployment.AllDeployerKeys` function

deployment/environment.go

@@ -7,7 +7,6 @@ import (
 	"slices"
 	"sort"
 
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/smartcontractkit/chainlink-common/pkg/logger"
@@ -297,15 +296,6 @@ func (e Environment) AllChainSelectorsAllFamiliesExcluding(excluding []uint64) [
 	return ret
 }
 
-func (e Environment) AllDeployerKeys() []common.Address {
-	deployerKeys := make([]common.Address, 0, len(e.Chains))
-	for sel := range e.Chains {
-		deployerKeys = append(deployerKeys, e.Chains[sel].DeployerKey.From)
-	}
-
-	return deployerKeys
-}
-
 // ConfirmIfNoError confirms the transaction if no error occurred.
 // if the error is a DataError, it will return the decoded error message and data.
 func ConfirmIfNoError(chain Chain, tx *types.Transaction, err error) (uint64, error) {