Fix LT-21889: Add Find and Fix step for removing disowned children

[jtmaxwell3]

This fixes https://jira.sil.org/browse/LT-21889. If the owner and stored owner don't match and the owner exists and the stored owner doesn't exist then the node has been disowned. This revealed some problems with the unit tests (type="o" instead of t="o").

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This change is 

[github-actions]

LCM Tests

    16 files  ±0      16 suites  ±0   3m 5s ⏱️ +5s
 2 858 tests ±0   2 838 ✅ ±0   20 💤 ±0  0 ❌ ±0 
11 380 runs  ±0  11 212 ✅ ±0  168 💤 ±0  0 ❌ ±0 

Results for commit f355c09. ± Comparison against base commit c459605.

[jasonleenaylor]

tests/SIL.LCModel.FixData.Tests/FwDataFixerTests.cs line 484 at r1 (raw file):

			Assert.That(_errors[8], Is.EqualTo("Removing dangling link to Form '" + danglingMsaGuid + "' for WfiMorphBundle '" + danglingMorphNoRepairGuid + "'."),
				"Error message is incorrect."); // MorphBundleFixer--ksRemovingDanglingMorph
			Assert.True(_errors[9].StartsWith("Removing disowned object (invalid ownerguid='" + disownedOwnerGuid),

The added assert for the error message is good, but we should also have a new assert for the actual data being removed. I expected to see an assert below in the // Check file repair section