Do not override methods unnecessarily in VdbProvider/PostgresProvider
>>> [!note] Migrated issue
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Reported by: [mxr576](https://www.drupal.org/user/315522)
Related to !66
>>>
<p>[Tracker]<br>
<strong>Update Summary: </strong>[One-line status update for stakeholders]<br>
<strong>Check-in Date: </strong>MM/DD/YYYY<br>
<strong>Blocked by: </strong>[#XXXXXX] (New issues on new lines)<br>
<strong>Additional Collaborators: </strong> @username1, @username2<br>
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<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>I think the <code>isMultiple() </code> method override was mistakenly introduced in <a href="https://git.drupalcode.org/project/ai_provider_amazeeio/-/commit/22dcc5ffc64c904ff239386f4505ea4eba00221c">a seemingly unrelated commit</a>. Whether the field holds multiple values or not should be decided by the base class (unless there is a bug in it which requires hotfixing).</p>
<p><code>deleteIndexItems()</code> is also just a verbatim copy of the upstream code: <a href="https://git.drupalcode.org/project/ai/-/blob/1.3.3/src/Base/AiVdbProviderClientBase.php?ref_type=tags#L370-375">https://git.drupalcode.org/project/ai/-/blob/1.3.3/src/Base/AiVdbProviderClientBase.php?ref_type=tags#L370-375</a></p>
<p>See my original report in <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-13"><a href="https://www.drupal.org/project/ai_provider_amazeeio/issues/3583923" title="Status: Needs work">#3583923: Testing & stable release for version 1.3.0</a></span>.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
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<h3 id="summary-ai-usage">AI usage (if applicable)</h3>
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<p>[ ] AI Generated Code<br>
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