fix: Streams Data Lake column not shown on cloud

[gally47]

This PR fixes the Streams Data Lake column not being shown on Cloud by moving the column contribution out of the internal-only dataLake.getStreamDataLakeTableElements export and into the generic top-level components.streams.overview.tableElements extension point used by StreamsOverview. Unlike the old path, this export is gated by DATA_LAKE_ENABLED rather than the internal-only Cloud gate DATA_LAKE_INTERNAL_ENABLED, so the column can show on Cloud as well.

/jpd https://github.com/Graylog2/graylog-plugin-enterprise/pull/13724

/nocl

Motivation and Context

fixes https://github.com/Graylog2/graylog-plugin-enterprise/issues/13654

Screenshots (if appropriate):

How can this be tested?

check if both internal and external data lakes are preview-able on both cloud and on-prem, via stream page data lake column (preview logs button).

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.

[Copilot]

Pull request overview

This PR fixes the missing “Data Lake” column in the Streams overview on cloud by switching the Streams overview table extension mechanism from the dataLake plugin export to a dedicated plugin export key for stream-overview-specific table elements.

Changes:

• Replaced direct dataLake plugin export usage and current-user-permission plumbing with a new useStreamsOverviewExtensions() hook.
• Added a new plugin export key (components.streams.overview.tableElements) and corresponding TypeScript types to allow plugins to contribute Streams overview columns/attributes.
• Added a UI test ensuring plugin-provided Streams overview table elements (header + cell rendering) are displayed.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
graylog2-web-interface/src/components/streams/StreamsOverview/StreamsOverview.tsx	Switches Streams overview to use the new extensions hook for plugin-provided columns/attributes.
graylog2-web-interface/src/components/streams/StreamsOverview/StreamsOverview.test.tsx	Adds coverage for rendering plugin-contributed Streams overview table elements.
graylog2-web-interface/src/components/streams/StreamsOverview/hooks/useStreamsOverviewExtensions.ts	Introduces stream-specific plugin extension merging with generic entity-table extensions.
graylog2-web-interface/src/components/streams/StreamsOverview/Constants.ts	Updates default layout/attributes to incorporate extension-provided attributes.
graylog2-web-interface/src/components/streams/StreamsOverview/ColumnRenderers.tsx	Updates custom column renderers to consume merged extension renderers (no dataLake export dependency).
graylog2-web-interface/src/@types/graylog-web-plugin/index.d.ts	Adds new plugin export typing for Streams overview table elements and removes the legacy Data Lake table element typing.

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