fix(14755): Fix Event Definition type filter wording and missing system notification type

[zeeklop]

Description

• Renamed the Event Definitions page's "Type" filter/column label to "Event Definition Type" in EventDefinitionsResource.java, so it no longer shares wording with the unrelated Alert/Event type filter on the Alerts & Events page.
• Added a frontend eventDefinitionTypes plugin-registry entry for system-notifications-v1 (bindings.ts), so the System Event Definition type now appears as a filter option. It follows the same hideFromCreation pattern used for sigma-v1/sigma-correlation-v1 (visible as a filter, hidden from the create wizard, no form/summary component since it's never user-editable). Made formComponent/summaryComponent optional on EventDefinitionType in types.ts to support that.
• sigma-correlation-v1 was already showing up correctly (fixed by an unrelated commit merged after this issue was filed), so no changes were needed for that part.

Motivation and Context

Closes: Graylog2/graylog-plugin-enterprise#14755

The Event Definitions type filter had inconsistent wording (same label as the unrelated Alerts & Events type filter) and was missing the system-notifications-v1 type.

How Has This Been Tested?

• yarn tsgo, yarn lint:path on changed files
• yarn test --testPathPatterns=event-definitions (19 suites / 121 tests)
• yarn test --testPathPatterns=components/events (13 suites / 58 tests, covers ColumnRenderers/EventDefinitionTypeRenderer)
• ./mvnw test -pl :graylog2-server -Dtest=EventDefinitionsResourceTest -Dskip.web.build=true -Dmaven.javadoc.skip=true (10/10 tests)
• Added new test bindings.test.ts covering the new registry entry.

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.

🤖 Generated with Claude Code

[Copilot]

🟢 Approval recommended

No unresolved issues were identified in the reviewed changes.

Pull request overview

Fixes Event Definition type labeling and adds system-notifications-v1 to the frontend type filter.

Changes:

• Renames the type label to “Event Definition Type”.
• Registers system notifications as a filter-only type.
• Makes components optional for non-editable types.
• Adds tests and a changelog entry.

File summaries

File	Summary
graylog2-web-interface/src/components/event-definitions/types.ts	Allows component-less event definition types.
graylog2-web-interface/src/components/event-definitions/event-definition-types/bindings.ts	Registers the system event definition type.
graylog2-web-interface/src/components/event-definitions/event-definition-types/bindings.test.ts	Tests the new registry entry.
graylog2-server/src/main/java/org/graylog/events/rest/EventDefinitionsResource.java	Updates the type attribute label.
changelog/unreleased/issue-14755.toml	Documents the fix.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 0
• Review effort level: Lite

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[danotorrey]

LGTM and tests successfully. Just one CL change needed to add pull request number.

[danotorrey]

Add PR number to CL.

Suggested change

	pulls = ["27397"]