[UI Feature] The UI should show that a task is pending due to `cache_serialize=True`

Motivation: Why do you think this is important?

Cache serializing is a convenient mechanism to prevent expensive computation to be performed multiple times in parallel.

However, when a task is pending because of cache_serialize=True, there is no way for users to see that this is the reason and not a potential other problem.

Goal: What should the final outcome look like, ideally?

When a task is pending because it is waiting for another execution with the same cache version and input kwargs, the UI should mention this and provide a link to the execution blocking the one at hand.

Propose: Link/Inline OR Additional context

No response

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes