Enable whitespace linter & fix findings (#12273)

* Enable whitespace linter & fix findings

* Fix new finding

* fix new violation

---------

Co-authored-by: Radosław Kapka <rkapka@wp.pl>
Co-authored-by: Preston Van Loon <preston@prysmaticlabs.com>
Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

validator/keymanager/derived/keymanager.go

@@ -172,5 +172,4 @@ func (km *Keymanager) ListKeymanagerAccounts(ctx context.Context, cfg keymanager
 		fmt.Println(" ")
 	}
 	return nil
-
 }

validator/keymanager/local/keymanager.go

@@ -277,7 +277,6 @@ func (km *Keymanager) SaveStoreAndReInitialize(ctx context.Context, store *accou
 	accountsKeystore, err := CreateAccountsKeystoreRepresentation(ctx, store, km.wallet.Password())
 	if err != nil {
 		return err
-
 	}
 	encodedAccounts, err := json.MarshalIndent(accountsKeystore, "", "\t")
 	if err != nil {

validator/keymanager/remote-web3signer/v1/custom_mappers.go

@@ -348,7 +348,6 @@ func MapBeaconBlockBodyAltair(body *ethpb.BeaconBlockBodyAltair) (*BeaconBlockBo
 		block.Deposits[i] = deposit
 	}
 	for i, exit := range body.VoluntaryExits {
-
 		exit, err := MapSignedVoluntaryExit(exit)
 		if err != nil {
 			return nil, fmt.Errorf("could not map signed voluntary exit at index %v: %v", i, err)

validator/keymanager/remote-web3signer/v1/mock/mocks.go

@@ -620,7 +620,6 @@ func MockForkInfo() *v1.ForkInfo {
 		},
 		GenesisValidatorsRoot: make([]byte, fieldparams.RootLength),
 	}
-
 }
 
 // MockAttestation is a mock implementation of the Attestation.