[TASK:T13] fix mount-pages issues

[dkd-kaehm]

• ConnectionManagerTest::canFindSolrConnectionForMountedPageIfMountPointIsGiven
• PageIndexerTest::canIndexMountedPage
• PageIndexerTest::canIndexMultipleMountedPage

1) ApacheSolrForTypo3\Solr\Tests\Integration\ConnectionManagerTest::canFindSolrConnectionForMountedPageIfMountPointIsGiven
ApacheSolrForTypo3\Solr\NoSolrConnectionFoundException: Could not find a Solr connection for page [24] and language [0].

/home/runner/work/ext-solr/ext-solr/.Build/vendor/typo3/cms-core/Classes/Utility/GeneralUtility.php:2808
/home/runner/work/ext-solr/ext-solr/Classes/ConnectionManager.php:231
/home/runner/work/ext-solr/ext-solr/Classes/ConnectionManager.php:206
/home/runner/work/ext-solr/ext-solr/Classes/ConnectionManager.php:118
/home/runner/work/ext-solr/ext-solr/Tests/Integration/ConnectionManagerTest.php:219

--

2) ApacheSolrForTypo3\Solr\Tests\Integration\IndexQueue\FrontendHelper\PageIndexerTest::canIndexMountedPage
Could not find content from mounted page in solr
Failed asserting that '{\n
  "responseHeader":{\n
    "status":0,\n
    "QTime":0,\n
    "params":{\n
      "q":"*:*"}},\n
  "response":{"numFound":0,"start":0,"numFoundExact":true,"docs":[]\n
  }}\n
' [ASCII](length: 161) contains ""title":"FirstShared (Not root)"" [ASCII](length: 32).

/home/runner/work/ext-solr/ext-solr/Tests/Integration/IndexQueue/FrontendHelper/PageIndexerTest.php:316

3) ApacheSolrForTypo3\Solr\Tests\Integration\IndexQueue\FrontendHelper\PageIndexerTest::canIndexMultipleMountedPage
Unexpected amount of documents in the core
Failed asserting that '{\n
  "responseHeader":{\n
    "status":0,\n
    "QTime":0,\n
    "params":{\n
      "q":"*:*"}},\n
  "response":{"numFound":0,"start":0,"numFoundExact":true,"docs":[]\n
  }}\n
' [ASCII](length: 161) contains ""numFound":2" [ASCII](length: 12).

/home/runner/work/ext-solr/ext-solr/Tests/Integration/IndexQueue/FrontendHelper/PageIndexerTest.php:351