refactor: Add isOrganizeColumnsAvailable flag to IrisGrid

[vbabich]

Controls visiblity of the Organize Columns menu in Table Options

[Copilot]

Pull Request Overview

This PR introduces a new flag, isOrganizeColumnsAvailable, to control the visibility of the Organize Columns menu in Table Options. Key changes include:

• Adding a getter for isOrganizeColumnsAvailable that returns true in IrisGridTreeTableModel and IrisGridTableModelTemplate.
• Adding a getter for isOrganizeColumnsAvailable that returns false in IrisGridModel.
• Updating IrisGrid.tsx to incorporate the new flag in the component’s options.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/iris-grid/src/IrisGridTreeTableModel.ts	Adds a getter returning true for isOrganizeColumnsAvailable
packages/iris-grid/src/IrisGridTableModelTemplate.ts	Adds a getter returning true for isOrganizeColumnsAvailable
packages/iris-grid/src/IrisGridModel.ts	Introduces a getter returning false for isOrganizeColumnsAvailable; note inconsistency
packages/iris-grid/src/IrisGrid.tsx	Incorporates the new flag in the options list

Comments suppressed due to low confidence (1)

packages/iris-grid/src/IrisGridModel.ts:435

• The value for isOrganizeColumnsAvailable is set to false in IrisGridModel, while the corresponding getters in IrisGridTreeTableModel and IrisGridTableModelTemplate return true. Consider making the behavior consistent to avoid unexpected UI discrepancies.

return false;