Pass relative path IsFileExcluded so that only paths relative to the root scan folder are matched against the exclude filters (#4504)

* Pass relative path IsFileExcluded so that only paths relative to the root scan folder are matched against the exclude filters.

Signed-off-by: amzn-sj <srikkant@amazon.com>

* Revert previous change. Remove the exclude filter for the Install directory.

Signed-off-by: amzn-sj <srikkant@amazon.com>

* Pass in relative path to the exclude filter as before. Fix the AssetScanner tests.

Signed-off-by: amzn-sj <srikkant@amazon.com>

* Prepend a ./ to the relative path in order to match the exclude patterns

Signed-off-by: amzn-sj <srikkant@amazon.com>

* Remove hack to prepend ./. Update the exclude patterns so that the hack is no longer required.

Signed-off-by: amzn-sj <srikkant@amazon.com>

* Add missing ? and remove whitespace

Signed-off-by: amzn-sj <srikkant@amazon.com>

* 1. IsFileExcluded() now converts the input path to a path that's relative to its corresponding scan folder.
2. Update regex patterns in gems and AutomatedTesting as well.
3. Remove unnecessary escaping for '/'.

Signed-off-by: amzn-sj <srikkant@amazon.com>

* Use ConvertToRelativePath() function to compute path relative to a scan folder.

Signed-off-by: amzn-sj <srikkant@amazon.com>

* More fixes to regex patterns

Signed-off-by: amzn-sj <srikkant@amazon.com>

* Remove test case which tests a hypothetical scenario that cannot occur. Fix another test case by adding scan folder.

Signed-off-by: amzn-sj <srikkant@amazon.com>

* Remove assert that's not needed since it's a valid scenario

Signed-off-by: amzn-sj <srikkant@amazon.com>
Signed-off-by: Gene Walters <genewalt@amazon.com>

Code/Tools/AssetProcessor/native/utilities/PlatformConfiguration.cpp

@@ -1633,13 +1633,18 @@ namespace AssetProcessor
 
     bool AssetProcessor::PlatformConfiguration::IsFileExcluded(QString fileName) const
     {
-        for (const ExcludeAssetRecognizer& excludeRecognizer : m_excludeAssetRecognizers)
+        QString relPath, scanFolderName;
+        if (ConvertToRelativePath(fileName, relPath, scanFolderName))
         {
-            if (excludeRecognizer.m_patternMatcher.MatchesPath(fileName.toUtf8().constData()))
+            for (const ExcludeAssetRecognizer& excludeRecognizer : m_excludeAssetRecognizers)
             {
-                return true;
+                if (excludeRecognizer.m_patternMatcher.MatchesPath(relPath.toUtf8().constData()))
+                {
+                    return true;
+                }
             }
         }
+
         return false;
     }