fix(ehi-export): initialize variables in createExportTasksFromJobWith… (openemr#10830)

Fixes openemr#10808

#### Short description of what this resolves:
This PR fixes "Undefined variable" notices in the EHI Export service.
Previously, $tasks and $currentDocumentSize were used/returned before
being initialized, which could trigger PHP errors if the patient loops
were skipped or upon the first iteration of a document size calculation.

#### Changes proposed in this pull request:
Define the variables

#### Does your code include anything generated by an AI Engine?
No


Testing performed:

Ran devtools php-parserror (Passed).

Ran devtools phpstan and confirmed the "Ignored error pattern" warnings
for these variables are now appearing as "not matched," confirming the
fix.

Author: robinson-j16

.phpstan/baseline/variable.undefined.php

@@ -12226,11 +12226,6 @@
     'count' => 2,
     'path' => __DIR__ . '/../../interface/modules/custom_modules/oe-module-ehi-exporter/public/index.php',
 ];
-$ignoreErrors[] = [
-    'message' => '#^Variable \\$currentDocumentSize might not be defined\\.$#',
-    'count' => 1,
-    'path' => __DIR__ . '/../../interface/modules/custom_modules/oe-module-ehi-exporter/src/Services/EhiExporter.php',
-];
 $ignoreErrors[] = [
     'message' => '#^Variable \\$job might not be defined\\.$#',
     'count' => 4,
@@ -12241,11 +12236,6 @@
     'count' => 1,
     'path' => __DIR__ . '/../../interface/modules/custom_modules/oe-module-ehi-exporter/src/Services/EhiExporter.php',
 ];
-$ignoreErrors[] = [
-    'message' => '#^Variable \\$tasks might not be defined\\.$#',
-    'count' => 1,
-    'path' => __DIR__ . '/../../interface/modules/custom_modules/oe-module-ehi-exporter/src/Services/EhiExporter.php',
-];
 $ignoreErrors[] = [
     'message' => '#^Variable \\$pid might not be defined\\.$#',
     'count' => 1,

interface/modules/custom_modules/oe-module-ehi-exporter/src/Services/EhiExporter.php

@@ -755,6 +755,8 @@ private function addDocumentationReadme(\ZipArchive $zip)
 
     private function createExportTasksFromJobWithoutDocuments(EhiExportJob $job, array &$jobPatientIds, int $jobPatientIdsCount)
     {
+        $tasks = [];
+        $currentDocumentSize = 0;
         $task = new EhiExportJobTask();
         $task->ehi_export_job_id = $job->getId();
         $task->ehiExportJob = $job;