chore: add build output log for TAs and its verification (#1840)

**Issue number:**

### PR Type

**What kind of change does this PR introduce?**
* [ ] Feature
* [ ] Bug Fix
* [ ] Refactoring (no functional or API changes)
* [ ] Documentation Update
* [x] Maintenance (dependency updates, CI, etc.)

## Summary

Right now even if pipeline [contains error
message](https://github.com/splunk/addonfactory-ucc-generator/actions/runs/16296222793/job/46018597916#logs)
the job is marked as success.
After this change the pipelines should correctly fail when some errors
appear.

### Changes

Verify if TAs build output were correct or some error occurred.

### User experience

N/A

## Checklist

If an item doesn't apply to your changes, leave it unchecked.

### Review

* [x] self-review - I have performed a self-review of this change
according to the [development
guidelines](https://splunk.github.io/addonfactory-ucc-generator/contributing/#development-guidelines)
* [ ] Changes are documented. The documentation is understandable,
examples work [(more
info)](https://splunk.github.io/addonfactory-ucc-generator/contributing/#documentation-guidelines)
* [x] PR title and description follows the [contributing
principles](https://splunk.github.io/addonfactory-ucc-generator/contributing/#pull-requests)
* [ ] meeting - I have scheduled a meeting or recorded a demo to explain
these changes (if there is a video, put a link below and in the ticket)

### Tests

See [the testing
doc](https://splunk.github.io/addonfactory-ucc-generator/contributing/#build-and-test).

* [ ] Unit - tests have been added/modified to cover the changes
* [ ] Smoke - tests have been added/modified to cover the changes
* [ ] UI - tests have been added/modified to cover the changes
* [ ] coverage - I have checked the code coverage of my changes [(see
more)](https://splunk.github.io/addonfactory-ucc-generator/contributing/#checking-the-code-coverage)

**Demo/meeting:**

*Reviewers are encouraged to request meetings or demos if any part of
the change is unclear*

Author: soleksy-splunk

.github/workflows/ta-tests.yml

@@ -150,4 +150,14 @@ jobs:
       - name: Run ucc-gen build in Target Add-on
         working-directory: TA
         run: |
-          poetry run ucc-gen build
+          poetry run ucc-gen build > build_output.log 2>&1
+          if tail -n 1 build_output.log | grep -q "^INFO: File creation summary: created: "; then
+            echo "✓ Build completed successfully with expected output"
+            cat build_output.log
+          else
+            echo "✗ Build did not complete with expected output"
+            echo "Last line of output should start with 'INFO: File creation summary: created: '"
+            echo "Full output:"
+            cat build_output.log
+            exit 1
+          fi