Use ErrorContext::RunCondition variant when reporting errors from run conditions. (#20061)

# Objective

The `ErrorContext::RunCondition` variant is never used. When reporting
errors from a run condition, `ErrorContext::System` is currently used
instead.

## Solution

Use `ErrorContext::RunCondition` variant when reporting errors from run
conditions.

Author: chescock

crates/bevy_ecs/src/schedule/executor/multi_threaded.rs

@@ -852,7 +852,7 @@ unsafe fn evaluate_and_fold_conditions(
                     if let RunSystemError::Failed(err) = err {
                         error_handler(
                             err,
-                            ErrorContext::System {
+                            ErrorContext::RunCondition {
                                 name: condition.name(),
                                 last_run: condition.get_last_run(),
                             },

crates/bevy_ecs/src/schedule/executor/simple.rs

@@ -207,7 +207,7 @@ fn evaluate_and_fold_conditions(
                     if let RunSystemError::Failed(err) = err {
                         error_handler(
                             err,
-                            ErrorContext::System {
+                            ErrorContext::RunCondition {
                                 name: condition.name(),
                                 last_run: condition.get_last_run(),
                             },

crates/bevy_ecs/src/schedule/executor/single_threaded.rs

@@ -224,7 +224,7 @@ fn evaluate_and_fold_conditions(
                     if let RunSystemError::Failed(err) = err {
                         error_handler(
                             err,
-                            ErrorContext::System {
+                            ErrorContext::RunCondition {
                                 name: condition.name(),
                                 last_run: condition.get_last_run(),
                             },