[MRG] feat: Add itemcount in project job overview & item job detail

[joaquingx]

Description

Add item count in job overview and item job detail

Issue

• Github Issue ID.

Checklist before requesting a review

• I have performed a self-review of my code.
• My code follows the style guidelines of this project.
• I have made corresponding changes to the documentation.
• New and existing tests pass locally with my changes.
• If this change is a core feature, I have added thorough tests.
• If this change affects or depends on the behavior of other estela repositories, I have created pull requests with the relevant changes in the affected repositories. Please, refer to our official documentation.
• I understand that my pull request may be closed if it becomes obvious or I did not perform all of the steps above.

[joaquingx]

Job Detail page adds item count:

Running jobs in project-job overview now displays the item count:

[mgonnav]

LGTM!