bcFetchData should load data of hierarchy of BCs

[DRITE]

see #698

Consider the following example:
An action bcFetchDataRequest with payload {widgetName: 'exampleWidgetName', bcName: 'grandParentBcName'} is dispatched.
Let bcName of 'exampleWidgetName' has name 'exampleWidgetBcName'. Also 'exampleWidgetName' includes showCondition with bcName: 'parentBcName'. And hierarchy of BC names is: 'grandParentBcName' is parent of 'parentBcName', 'parentBcName' is parent of 'exampleWidgetName'. Also current view doesn't include other widgets with BC name 'parentBcName' or 'grandParentBcName'.

In this case bcFetchData epic should load data of whole hierarchy of BCs from 'grandParentBcName' to 'exampleWidgetBcName'.

[sonarqubecloud]

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