fix: use join vs run for deleteRecord destroy of new records

[runspired]

resolves #8262

I'm not entirely convinced this is safe, though it passes tests. We're close to disentangling from the runloop entirely, should probably try to finish that off so we can be certain.

The rough cause of the issue is that Ember apparently now flushes render after every run, so nested runs are no longer safe. Unsure when this changed.

[github-actions]

Performance Report for dcfb5de

Scenario - basic-record-materialization: ☑️ Performance is stable

☑️ duration
phase no difference [-20ms to 1ms]
☑️ Phase [navigationStart] => [start-data-generation]
phase no difference [-2ms to 1ms]
✅ Phase [start-data-generation] => [start-push-payload]
phase estimated improvement -3ms [-4ms to -1ms] OR -0.68% [-1.03% to -0.32%]
✅ Phase [start-push-payload] => [start-peek-records]
phase estimated improvement -8ms [-14ms to -1ms] OR -0.59% [-1.09% to -0.09%]
☑️ Phase [start-peek-records] => [start-record-materialization]
phase no difference [0ms to 0ms]
☑️ Phase [start-record-materialization] => [end-record-materialization]
phase no difference [-5ms to 6ms]
☑️ Phase [end-record-materialization] => [Test End]
phase no difference [0ms to 0ms]

Scenario - relationship-materialization-simple: ☑️ Performance is stable

☑️ duration
phase no difference [-5ms to 6ms]
☑️ Phase [navigationStart] => [start-find-all]
phase no difference [-1ms to 1ms]
☑️ Phase [start-find-all] => [start-materialization]
phase no difference [-5ms to 0ms]
☑️ Phase [start-materialization] => [end-materialization]
phase no difference [-8ms to 6ms]
☑️ Phase [end-materialization] => [Test End]
phase no difference [-2ms to 4ms]

Scenario - relationship-materialization-complex: ☑️ Performance is stable

☑️ duration
phase no difference [-21ms to 19ms]
☑️ Phase [navigationStart] => [start-data-generation]
phase no difference [-1ms to 2ms]
☑️ Phase [start-data-generation] => [start-push-payload]
phase no difference [0ms to 1ms]
✅ Phase [start-push-payload] => [start-peek-records]
phase estimated improvement -7ms [-11ms to -3ms] OR -1.04% [-1.72% to -0.4%]
☑️ Phase [start-peek-records] => [start-record-materialization]
phase no difference [0ms to 0ms]
☑️ Phase [start-record-materialization] => [start-relationship-materialization]
phase no difference [-3ms to 3ms]
☑️ Phase [start-relationship-materialization] => [end-relationship-materialization]
phase no difference [-11ms to 23ms]
☑️ Phase [end-relationship-materialization] => [Test End]
phase no difference [-4ms to 2ms]

Scenario - unload: ☑️ Performance is stable

☑️ duration
phase no difference [-9ms to 1ms]
☑️ Phase [navigationStart] => [start-push-payload]
phase no difference [-4ms to 0ms]
☑️ Phase [start-push-payload] => [start-unload-records]
phase no difference [-5ms to 1ms]
☑️ Phase [start-unload-records] => [end-unload-records]
phase no difference [-1ms to 3ms]
☑️ Phase [end-unload-records] => [Test End]
phase no difference [0ms to 0ms]

Scenario - unload-all: ✅ Performance improved

✅ duration
phase estimated improvement -10ms [-18ms to -2ms] OR -0.54% [-0.95% to -0.08%]
☑️ Phase [navigationStart] => [start-push-payload]
phase no difference [-1ms to 3ms]
✅ Phase [start-push-payload] => [start-materialization]
phase estimated improvement -11ms [-16ms to -6ms] OR -1.39% [-1.98% to -0.76%]
☑️ Phase [start-materialization] => [start-unload-all]
phase no difference [-3ms to 1ms]
☑️ Phase [start-unload-all] => [end-unload-all]
phase no difference [-3ms to 4ms]
☑️ Phase [end-unload-all] => [Test End]
phase no difference [0ms to 0ms]

Scenario - destroy: ☑️ Performance is stable

☑️ duration
phase no difference [-3ms to 6ms]
☑️ Phase [navigationStart] => [start-push-payload]
phase no difference [-1ms to 2ms]
☑️ Phase [start-push-payload] => [start-destroy-records]
phase no difference [-4ms to 2ms]
☑️ Phase [start-destroy-records] => [end-destroy-records]
phase no difference [-1ms to 3ms]
☑️ Phase [end-destroy-records] => [Test End]
phase no difference [0ms to 0ms]

Scenario - add-children: ☑️ Performance is stable

☑️ duration
phase no difference [-5ms to 5ms]
☑️ Phase [navigationStart] => [start-push-initial-payload]
phase no difference [-4ms to 3ms]
☑️ Phase [start-push-initial-payload] => [start-push-update-payload]
phase no difference [-1ms to 3ms]
☑️ Phase [start-push-update-payload] => [end-push-update-payload]
phase no difference [-3ms to 1ms]
☑️ Phase [end-push-update-payload] => [Test End]
phase no difference [0ms to 0ms]

Scenario - unused-relationships: ☑️ Performance is stable

☑️ duration
phase no difference [-3ms to 6ms]
☑️ Phase [navigationStart] => [start-push-payload]
phase no difference [-2ms to 2ms]
☑️ Phase [start-push-payload] => [end-push-payload]
phase no difference [-1ms to 5ms]
☑️ Phase [end-push-payload] => [Test End]
phase no difference [0ms to 0ms]