Include issues in sub-epics when filtering by epic

Problem to solve

As a user of Epics,

I need to be able to be able to quickly pull a list of issues from a specific Epic,

So I can find the right issues with the right parameters, and not spend a ton of time opneing tabs, and context switching.

Intended users

Proposal

Enable users to filter an issue list by an epic:

From project issue list
From group issue list

We should also include the Epic Id in the csv export so that data is maintained.

Documentation

Links / references

Icon should be information-o

Note: this issue originally contained ability to filter by epics, not broken down. See details below.

#195704 (closed) allows for filtering by parent epic. This issue is for the next iteration, which is allowing of filtering by sub-epics.

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Edited Nov 08, 2021 by 🤖 GitLab Bot 🤖