RDKBWIFI-364 : Generalizing bus abstraction functions for retrieving and setting bus data property types.

[hp490]

Reason for change : Converted the generic raw_data type to bus_data_prop_t.
Risks: Medium
Test Procedure: Flash the image and verify that all OneWifi-related features work properly.

[Copilot]

Pull request overview

This PR updates the WiFi emulator’s bus callback/data handling to use the newer bus_data_prop_t representation (instead of the legacy raw_data_t payload) and adapts UI + test event handlers accordingly.

Changes:

• Updated UI manager and test subscription callbacks to accept bus_data_prop_t* and added stricter payload/context validation.
• Improved allocation/error-handling paths (e.g., std::nothrow, centralized cleanup, consistent new[]/delete[] usage).
• Enhanced RBUS bridge to parse/set RBUS object properties into/from bus_data_prop_t chains, with explicit cleanup.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/ui/wlan_emu_ui_mgr.cpp	Updates webconfig bus event callback signature to bus_data_prop_t*, adds validation and safer allocation.
src/tests/wlan_emu_test_param_stats_get.cpp	Updates stats subscription callback signature and strengthens cleanup/error handling.
src/bus/rdkb/wlan_emu_bus.cpp	Adds conversion/free helpers for bus_data_prop_t and updates RBUS sub/method handlers to use it.
inc/wlan_emu_ui_mgr.h	Updates callback/function-pointer declarations to bus_data_prop_t*.
inc/wlan_emu_test_params.h	Updates stats callback declaration to bus_data_prop_t*.

Comments suppressed due to low confidence (1)

src/ui/wlan_emu_ui_mgr.cpp:4863

• userData is used later to obtain ptr, so the (void)userData; suppression is now stale. Also len is assigned from bus_data->value.raw_data_len but never used. Please remove the unused suppression/variable (or use len meaningfully) to avoid dead code and keep warnings meaningful.

    (void)userData;
    int len = 0;
    char *pTmp = NULL;
    webconfig_subdoc_data_t *data = NULL;
    wlan_emu_ui_mgr_t *ptr;

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