### Godot version

4.1

### System information

Windows

### Issue description

Being able to have multiple cursors similarly to vscode is a great feature, however it's only possible to add carets, not remove them. By left clicking you can remove all extra cursors but you cannot remove a specific one so after selecting multiple lines a single missclick, you have to reselect them all again. Looking at the original pr there was a remove_caret function added so it would make sense to be able to remove carets when clicking again, like in vscode.

![image](https://github.com/godotengine/godot/assets/19669673/3867c00e-9faa-4429-9c6d-f2d6d3883044)


### Steps to reproduce

- Alt click to add multiple carets
- Alt click on the same position again
- Nothing happens

### Minimal reproduction project

N/A
}
										} while (cc != quotation);
									} else if (cc == c) {
										stack++;
									} else if (cc == closec) {
										stack--;
									}
									if (stack == 0) {
										brace_matching.write[caret].open_match_line = i;
										brace_matching.write[caret].open_match_column = j;
										brace_matching.write[caret].open_matching = true;
										break;
									}
								}
								if (brace_matching.write[caret].open_match_line != -1) {
									break;
								}
							}
							if (!brace_matching.write[caret].open_matching) {
								brace_matching.write[caret].open_mismatch = true;
							}
						}
					}
					if (get_caret_column(caret) > 0) {
						char32_t c = text[get_caret_line(caret)][get_caret_column(caret) - 1];
						char32_t closec = 0;
						if (c == ']') {
							closec = '[';
						} else if (c == '}') {
							closec = '{';