Fix output in agent tool use

[paulbalandan]

In agent tool uses, I just noticed that output tries to overwrite the progress bar but it's not possible in the terminal used by the agent.

Note: Using configuration file /Users/paul/Workspace/CodeIgniter4/phpstan.neon.
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�[30;42m                                                                                �[39;49m
�[30;42m [OK] No errors                                                                 �[39;49m
�[30;42m                                                                                �[39;49m

Elapsed time: 23.12 seconds
Used memory: 2.58 GB

This change is purely cosmetic for agents just to be consistent with CI environments.

[phpstan-bot]

You've opened the pull request against the latest branch 2.2.x. PHPStan 2.2 is not going to be released for months. If your code is relevant on 2.1.x and you want it to be released sooner, please rebase your pull request and change its target to 2.1.x.

[staabm]

I think its fine to only assert on the rendered output. no need to complicate this test with this non-public implementation details

[paulbalandan]

Thanks. Limited the test to asserting the rendered output.