Fix Goroutine Leak of Environment Get

that was caused by creating an intermediate environment `fetchedEnvironment` when fetching the environments but not removing it in case that we just copy its configuration to the existing environment.

internal/runner/execution_environment.go

@@ -38,7 +38,8 @@ type ExecutionEnvironment interface {
 	// Register saves this environment at the executor.
 	Register() error
 	// Delete removes this environment and all it's runner from the executor and Poseidon itself.
-	Delete() error
+	// Iff local the environment is just removed from Poseidon without external escalation.
+	Delete(local bool) error
 
 	// Sample returns and removes an arbitrary available runner.
 	// ok is true iff a runner was returned.

internal/runner/execution_environment_mock.go

@@ -1,4 +1,4 @@
-// Code generated by mockery v2.33.1. DO NOT EDIT.
+// Code generated by mockery v2.33.2. DO NOT EDIT.
 
 package runner
 
@@ -45,13 +45,13 @@ func (_m *ExecutionEnvironmentMock) CPULimit() uint {
 	return r0
 }
 
-// Delete provides a mock function with given fields:
-func (_m *ExecutionEnvironmentMock) Delete() error {
-	ret := _m.Called()
+// Delete provides a mock function with given fields: local
+func (_m *ExecutionEnvironmentMock) Delete(local bool) error {
+	ret := _m.Called(local)
 
 	var r0 error
-	if rf, ok := ret.Get(0).(func() error); ok {
-		r0 = rf()
+	if rf, ok := ret.Get(0).(func(bool) error); ok {
+		r0 = rf(local)
 	} else {
 		r0 = ret.Error(0)
 	}