Enable users to fetch all WorkItems they have access through GraphQL

What does this MR do and why?

Enable users to fetch all WorkItems they have access through GraphQL, similar to the existing issues query.

Example Query	Example Response
query q { workItems(state: opened) { nodes { iid } } }	{ "data": { "workItems": { "nodes": [{ "iid": "9" }, ...

References

• #471669 (closed)

MR acceptance checklist

• You have self-reviewed this MR per code review guidelines.
• The code follows the software design guidelines.
• Ensure automated tests exist following the testing pyramid. Add missing tests or create an issue documenting testing gaps.
• You have considered the technical impacts on GitLab.com, Dedicated and self-managed.
• You have considered the impact of this change on the frontend, backend, and database portions of the system where appropriate and applied the ~ux, frontend, backend, and database labels accordingly.
• You have tested this MR in all supported browsers, or determined that this testing is not needed.
• You have confirmed that this change is backwards compatible across updates, or you have decided that this does not apply.
• You have properly separated EE content (if any) from FOSS. Consider running the CI pipelines in a FOSS context.
• You have considered that existing data may be surprisingly varied. For example, if adding a new model validation, consider making it optional on existing data.
• You have fixed flaky tests related to this MR, or have explained why they can be ignored. Flaky tests have error Flaky test '<path/to/test>' was found in the list of files changed by this MR. but can be in jobs that pass with warnings.

Screenshots or screen recordings

Not provided

How to set up and validate locally

1. In a browser, on a device with the GDK running, navigate to http://localhost:3000/-/graphql-explorer
2. Write a query to fetch work items (with at least 1 filter provided). e.g.

query q {
  workItems(state: opened) {
    nodes {
      id
    }
  }
}

3. Observe that work items are returned for which the current user has access to, across projects

changed milestone to %17.9

added devopsplan featureaddition groupproduct planning sectiondev typefeature work items labels

assigned to @kassio

added pipelinetier-1 label

added backend documentation labels

	1 Warning
	d69090e4: Commits that change 30 or more lines across at least 3 files should describe these changes in the commit body. For more information, take a look at our Commit message guidelines.

	1 Message
	This merge request adds or changes documentation files and requires Technical Writing review. The review should happen before merge, but can be post-merge if the merge request is time sensitive.

Documentation review

The following files require a review from a technical writer:

• doc/api/graphql/reference/_index.md (Link to current live version)

The review does not need to block merging this merge request. See the:

• Metadata for the *.md files that you've changed. The first few lines of each *.md file identify the stage and group most closely associated with your docs change.
• The Technical Writer assigned for that stage and group.
• Documentation workflows for information on when to assign a merge request for review.

Reviewer roulette

Category	Reviewer	Maintainer
backend	@ibaum (UTC-6, 7 hours behind author)	@engwan (UTC+8, 7 hours ahead of author)

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assigned to @mdangelo6

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