Tweak PHPStan config so paths are always correct and baseline is more usable
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3397162. -->
Reported by: [alexpott](https://www.drupal.org/user/157725)
Related to !189 !69
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Follow on from <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-7"><a href="https://www.drupal.org/project/gitlab_templates/issues/3395419" title="Status: Closed (fixed)">#3395419: Allow contrib modules to run PHPStan via GitLab CI</a></span></p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<ul>
<li>Run PHPStan from module directory so paths are correct</li>
<li>Remove baseline before generating a new one</li>
<li>Add new variable <code>_PHPSTAN_BASELINE_FILENAME</code> with default value 'phpstan-baseline.neon'</li>
</ul>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<h3 id="summary-data-model-changes">Data model changes</h3>
> Related issue: [Issue #3445001](https://www.drupal.org/node/3445001)
issue