Fix the error-level CodeQL findings: dead branches, a null factory, interned-string locks, racy lazy init

[vharseko]

Closes the 11 open CodeQL alerts of severity error that carry no security rating: java/contradictory-type-checks #1536 #1537, java/dereferenced-value-is-always-null #1560, java/sync-on-boxed-types #1554 #1555 #1556, java/unsafe-double-checked-locking #1549 #1550 #1551, java/unsynchronized-getter #1544 #1545.

Where	Finding	Change
SQLUtil.setParam	else if (val instanceof Integer) appears twice; the second branch can never run	second branch removed
ContractITCase.createInstances	IObjectFactory objectFactory = null is dereferenced for any test class with a (String) constructor — today none of the default classes has one, so it only worked because the NoSuchMethodException path was always taken	new ObjectFactoryImpl() (TestNG's default), and the unused nested ContractTestFactory with its three never-read fields is gone
BatchRemoteCache (testbundlev1)	synchronized (resultLock) on the interned literal "resultLock" — a monitor shared with any other code in the JVM that synchronises on the same string	new Object()
WebSocketConnectionGroup.operationContext, ScriptedConfiguration.groovyScriptEngine, TstStatefulConnectorConfig.executorService	double-checked lazy initialisation reading a non-volatile field outside the lock: a thread may see a partially constructed object	fields declared volatile, which makes the pattern correct under the JMM
FrameworkUtil.getFrameworkVersion()	unsynchronised lazy init while setFrameworkVersion is synchronised	static synchronized (not a hot path). The (ClassLoader) overload reads connectors-framework.properties rather than the field and is only used by FrameworkUtilTests; renamed to readFrameworkVersion so the getter/setter pairing no longer applies to it

No new tests: dead branches, volatile, a private monitor and a synchronised getter have no behaviour a unit test can observe, and createInstances takes its classes from a fixed list with no (String) constructors, so the null path cannot be reached from a test without restructuring the factory.

Local runs of the touched modules: connector-framework 189, dbcommon 43, connector-framework-server 29, groovy-connector 125 (42 skipped as on master), contract and testbundlev1 compile — all green.