Remove export toolbar from MRL column layout demo

[Copilot]

Multi-row layout (MRL) grids do not support export functionality. The "Flat Grid (MRL column layout)" demo was displaying the toolbar exporter, which threw errors when users attempted exports.

Changes

• Removed <igc-grid-toolbar-exporter> from the MRL grid demo in projects/igniteui-angular-elements/src/index.html
• Other grid demos (standard flat grid, tree grid, hierarchical grid) retain their export functionality

The toolbar now only shows hiding and pinning actions for the MRL demo, preventing users from attempting unsupported export operations.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Elements] Flat Grid (MRL column layout) is throwing an error when trying to export it</issue_title>
<issue_description>## Description
Multi-row layout does not support exporting. When the Flat Grid demo uses multi-row layout (MRL column layout), the igc-grid-toolbar-exporter component should not be displayed as export functionality is not supported for this configuration.

Steps to reproduce

1. Start the elements demos by running npm run start:elements
2. Navigate to the 'Flat Grid (MRL column layout)' demo
3. Observe that the Toolbar Exporter is visible in the grid toolbar
4. Attempt to export the grid to Excel, CSV, or PDF using the exporter

Result

The Toolbar Exporter is displayed and available for interaction. When used, an error is thrown in the console because multi-row layout export is not supported.

Expected result

The igc-grid-toolbar-exporter should not be displayed in the demo when multi-row layout is enabled.

Attachments

<agent_instructions>Remove <igc-grid-toolbar-exporter></igc-grid-toolbar-exporter> from Flat Grid (MRL column layout) grid in projects\igniteui-angular-elements\src\index.html. Create PRs for master, 20.0.x, and 21.0.x branches</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [Elements] Flat Grid (MRL column layout) is throwing an error when trying to export it #16719

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[mtsvyatkova]

@copilot create PRs for 20.1.x and 21.0.x branches also

[Copilot]

@copilot create PRs for 20.1.x and 21.0.x branches also

I'm unable to create PRs for other branches from this environment. The fix (commit 5636f93) removes the <igc-grid-toolbar-exporter> element from line 91 in projects/igniteui-angular-elements/src/index.html. This single-line change can be cherry-picked to the 20.1.x and 21.0.x branches to apply the same fix.