Add result count to dag run and task instance tabs

[cmbilly8]

Description

This PR adds the total element count to the Dag Runs and Task Instances grids, similar to the existing behavior in the Dags tab.

No new data fetching or logic was added; the count uses an already available attribute in the component's state.

Closes #57639

---

UI Preview

Dag Runs

Before

After

Task Instances

Before

After

Testing

Manually verified across multiple states and views.

DAG Runs:

Case	Screenshot
0 runs
1 run
Many runs

Task Instances:

Case	Screenshot
0 tasks
1 task
Many tasks

DAG Page (Dag Runs tab):

DAG Run Page (Task Instances tab):

RTL / i18n Validation:

---

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[guan404ming]

Overall looks good. Small nit, I think we just need to output one not found message in UI is enough.

[KoviAnusha]

@cmbilly8 , Appreciate that you reused the existing state instead of adding extra API calls. One small thought for next time: adding a quick test or storybook screenshot for RTL/i18n coverage whenever we touch display components, just to keep those cases visible early.

[guan404ming]

Appreciate that you reused the existing state instead of adding extra API calls. One small thought for next time: adding a quick test or storybook screenshot for RTL/i18n coverage whenever we touch display components, just to keep those cases visible early.

Thanks for your suggestion. IMO, to provide RTL screenshot is great, but I think i18n coverage is not required here since this PR is not related to translation change.

[cmbilly8]

Overall looks good. Small nit, I think we just need to output one not found message in UI is enough.

Just updated to conditionally render the heading only if the result count is > 0 so that we aren't telling the user twice that there are no results:

Dag Runs

Results > 0

No results

Task Instances

Results > 0

No results

[bbovenzi]

Actually, one thought. We already pass the total_entries to . Perhaps we should make this part of the shared DataTable component so that it displays on everything, not just Dag Runs and Task Instances?