feat: add share link button when hide from toc is enabled in sections (#34043)

* feat: add share link modal when hide from toc is enabled

Adds a new button in the child subsections of sections with Hide From TOC enabled.
This button displays a new modal with two tabs. The first tab displays a button
that allows you to copy the link of that subsection to the clipboard. The second
tab displays a button that allows you to copy the embedded link of the same
subsection to the clipboard.

Ref: https://openedx.atlassian.net/wiki/spaces/OEPM/pages/3853975595/Feature+Enhancement+Proposal+Hide+Sections+from+course+outline

cms/templates/js/embed-link-share-link-editor.underscore

@@ -0,0 +1,20 @@
+<div class="modal-section-content">
+    <div class="subsection-share-link-container">
+        <div>
+            <p>
+                <%- gettext('Embed your subsection content directly on a page using an iframe, and view it withput the LMS header and footer.') %>
+            </p>
+            <button
+                type="button"
+                id="embed-link-button"
+                data-clipboard-text="<%- embedLmsUrl %>"
+                title="<%- gettext('Click to copy link to clipboard') %>"
+                class="button btn-primary copy-link-button"
+            >
+                <span class="icon fa fa-clipboard icon-copy-clipboard"></span>
+                <span class="copy-link-button-text"><%- gettext('Copy link') %></span>
+            </button>
+        </div>
+        <img class="share-link-animated-svg" src="/static/studio/images/subsection-embed.svg">
+    </div>
+</div>