Improve issue empty state UI copy for new users

Roy Liurequested to merge
560277-improve-issue-empty-state-to-help-new-users into master

What does this MR do and why?

Update UI copy for issue empty state. Related to #560277

References

Screenshots or screen recordings

Before After
Group without issue before_group_without after_group_without
Group with issue before_group_with after_group_with
Project without issue before_project_without after_project_without
Project with issue before_project_with after_project_with

How to set up and validate locally

Empty state with issues are only available to view when these feature flags are disabled:

Feature.disable(:work_item_view_for_issues)
Feature.disable(:work_items_group_issues_list)

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Roy Liu

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