[ryan-carroll-graylog]

Note: This is a backport of #26990 to 7.1.

Backport notes

• Scoped to the fix itself. The purely cosmetic type cleanups from the original PR (dropping the now-redundant EventDefinition & { share_request? } intersection in EventDefinitionFormContainer.tsx, EventDefinitionSummary.tsx, and useEventDefinitionCommonSteps.tsx) were left out — they are no-ops here, and touching EventDefinitionFormContainer.tsx makes Reviewbot flag a pre-existing react-hooks/set-state-in-effect violation in that file that master fixed in a separate, unrelated commit.
• The new EventDefinitionFormContainer test case was omitted: it depends on the master-only useEntityShareState refactor (prepare().then(setEntityShareState)), whereas this branch reads share state from the reflux EntityShareStore and that test file mocks stores/connect non-reactively, so any adaptation would pass even with the fix reverted. The fix is covered by the two new EntityCreateShareFormGroup tests, which assert the restored selected_grantee_capabilities and the re-run dependency check.

Description

Keep the share settings of an event definition from getting cleared when navigating between wizard steps.

This turned out to affect all event definitions, not just sigma.

Motivation and Context

Closes: https://github.com/Graylog2/graylog-plugin-enterprise/issues/14480

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have requested a documentation update.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[ryan-carroll-graylog]

Tests successfully for me on https://server-pr-27059.dev.torch.sh/graylog/alerts/definitions

Note: that I had to make a few tweaks to the cherry-pick as noted in the description.

Please feel free to merge this once reviews are in.

[danotorrey]

LGTM and test successfully.