..F....... [ZBX-8349] first iteration of fixing unit tests.

validators to cover:

CDecimalValidator
CTimePeriodValidator
CTriggerFunctionValidator
event/CEventSourceObjectValidator
host/CHostNormalValidator
hostgroup/CHostGroupNormalValidator
object/CConditionValidator
objectCUpdateDiscoveredValidator
schema/CPartialSchemaValidator
schema/CSchemaValidator
string/CLldMacroStringValidator

incomplete tests/not yet written tests:

CLdapAuthValidator
CTextTriggerConstructorTest
CServicesSlaCalculatorTest
CConditionFormulaTest
CLocalApiClientTest