Merge https://github.com/google/adk-python/pull/3381
### Link to Issue or Description of Change
**1. Link to an existing issue (if applicable):**
- Closes: #3363
- This PR sets a max column width for the table printed in detailed output of agent evaluations.
**Problem:**
The detailed output of agent evaluations is not readable due to rows in the table getting wrapped. This happens when there are long text values in cells.
<img width="1904" height="717" alt="508807185-9e8fe1c3-d04a-43dd-acf9-0befaa1b247d" src="https://github.com/user-attachments/assets/61526ad2-8a9e-4c18-83e2-51a3b9b32d2b" />
**Solution:**
Existing code uses `tabulate` python package to format the table. We can set a maximum column width using `maxcolwidths` parameter. I have set it to `25`.
After the fix:
<img width="1882" height="711" alt="508810179-b91c5bca-fb43-480b-90ff-bca2e909417c" src="https://github.com/user-attachments/assets/b653f825-719e-4101-9acb-e28a52694cf8" />
### Testing Plan
I have manually tested if the output is properly displayed after changes. Please let me know if any unit tests can be added for this.
**Unit Tests:**
- [ ] I have added or updated unit tests for my change.
- [x] All unit tests pass locally.
<img width="1627" height="39" alt="image" src="https://github.com/user-attachments/assets/59a70619-3669-4113-8ab7-dcff130ee241" />
**Manual End-to-End (E2E) Tests:**
1. Create a simple agent using adk (preferably an agent that outputs a long text).
2. Create an evalset for this agent.
3. Run the evalset with `print_detailed_results` option and check if the output is properly displayed.
If you want a quick setup for testing this, I have a sample repo with an agent and an evalset [here](https://github.com/nimanthadilz/adk-test/tree/reproduce-print-detailed-results). You will have to manually build & install the fixed adk version to test it.
### Checklist
- [x] I have read the [CONTRIBUTING.md](https://github.com/google/adk-python/blob/main/CONTRIBUTING.md) document.
- [x] I have performed a self-review of my own code.
- [x] I have commented my code, particularly in hard-to-understand areas.
- [ ] I have added tests that prove my fix is effective or that my feature works.
- [x] New and existing unit tests pass locally with my changes.
- [x] I have manually tested my changes end-to-end.
- [x] Any dependent changes have been merged and published in downstream modules.
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/3381 from nimanthadilz:fix-eval-output-rows-wrapping-issue f6d40121f621df60c4596a1c62e0c54e4da309d3
PiperOrigin-RevId: 828265715
