Remove Canvas Dev Mode flag for Multi-Value Props support
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3577946. --> Reported by: [vipin.mittal18](https://www.drupal.org/user/319716) Related to !1010 !996 !817 !851 >>> <h3 id="overview">Overview</h3> <p>The issue involves removing the canvas_dev_mode flag for the Multi-value props support features. This change is necessary to transition these features into a production phase.</p> <h3>Context</h3> <p>The canvas_dev_mode flag was initially used for development and internal testing purposes. Its removal is essential for enabling Multi-value props support in a production environment without requiring the entire Canvas Dev Mode module.</p> <h3>Acceptance criteria</h3> <ul> <li>Remove the canvas_dev_mode flag for Multi-value props support.</li> <li>Ensure that Multi-value props can be used in production without enabling the entire Canvas Dev Mode module.</li> <li>Ensure multi-value checkbox in code component is available for supported prop types only stated below:. <ul> <li>Text</li> <li>Date</li> <li>Integer</li> <li>Number</li> <li>Image</li> <li>Video</li> </ul> </li> </ul> <h2>Additional Steps</h2> <ul> <li>In an initial branch, add e2e Playwright tests for this functionality with components</li> <li>In the branch that actually removes the dev flag, bring back any necessary coverage accidentally removed in <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-7"><a href="https://www.drupal.org/project/canvas/issues/3586022" title="Status: Closed (fixed)">#3586022: Fix multivalue-form-design*.cy.js flakiness</a></span> </li></ul>
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