Notebook cell actions are not announced to screenreader.

User does not really know when cell was run, stopped, moved, duplicated, etc. successfully or what the cell is currently outputting automatically without manually doing it as it's popping out (which they won't be able to see to know to follow alone.

**Issue Area # 4**
- **Expectation**: User is informed when content changes dynamically away from the focus (WCAG Criteria 3.2.2 (A), 4.1.2 (A), & 4.1.3 (AA))
- **Observed**: On notebook page when preforming all code cell actions (runs, stops, moves, duplications, etc.) it's not mentioning this to screenreaders. On move it should send a screenreader only alert saying ex. "Code cell number 4 has swapped with code cell 3 successfully" or at minimum "cell move successful". Whenever a cell is run, I expect it to say ex. "Running cell 3", say the output as it's happening, example "Packages already installed: pandas", etc. then will read either "Cell 3 finished successfully" or "Cell 3 failed. Error: {insert error}.

Start on the notebook page and reproduce code-cell runs, stops, moves, and duplications with a screenreader. Done means each action announces its status, dynamically produced output is announced, and completion or failure is reported with the relevant error.

Written by the indexing model from the issue text.