chore: Downgrade eclipse dep and pin osgi dep version (#13977) (#13980)

Downgrades org.eclipse.equinox.preferences dependency version to the one containing a correct groupId for org.osgi.service.prefs and pins org.osgi.service.prefs version.

flow-client/pom.xml

@@ -79,11 +79,29 @@
             <artifactId>asm</artifactId>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.service.prefs</artifactId>
+            <version>1.1.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.eclipse.platform</groupId>
+            <artifactId>org.eclipse.equinox.preferences</artifactId>
+            <version>3.9.100</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.eclipse.platform</groupId>
             <artifactId>org.eclipse.core.resources</artifactId>
             <version>3.12.0</version>
             <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.eclipse.platform</groupId>
+                    <artifactId>org.eclipse.equinox.preferences</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <!-- Force Java8 compatible package -->
         <dependency>
@@ -97,6 +115,12 @@
             <artifactId>org.eclipse.core.contenttype</artifactId>
             <version>3.7.1000</version>
             <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.eclipse.platform</groupId>
+                    <artifactId>org.eclipse.equinox.preferences</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
 
         <dependency>