test(e2e): Refactor vault setup method (#3724)

* refact(e2e): Pass in boundary-controller-policy to method

This allows any boundary-enterprise specific test packages to point to their own testdata directory

* test(e2e): Fix assertion statement

* refact(e2e): Move method call for clarity

testing/internal/e2e/tests/database/migration_test.go

@@ -235,7 +235,7 @@ func populateBoundaryDatabase(t testing.TB, ctx context.Context, c *config, te T
 	boundary.AddBrokeredCredentialSourceToTargetCli(t, ctx, newTargetId, newCredentialsId)
 
 	// Create vault credentials
-	boundaryPolicyName, kvPolicyFilePath := vault.Setup(t)
+	boundaryPolicyName, kvPolicyFilePath := vault.Setup(t, "testdata/boundary-controller-policy.hcl")
 	output := e2e.RunCommand(ctx, "vault",
 		e2e.WithArgs("secrets", "enable", "-path="+c.VaultSecretPath, "kv-v2"),
 	)