Remove duplicate pkg_check_modules definitions in PluginsTests

[Copilot]

Addresses review feedback on duplicate GStreamer package checks in test/utests/tests/PluginsTests/CMakeLists.txt.

Changes

• Removed duplicate pkg_check_modules calls: Individual GSTREAMER, GSTREAMERAPP, and GSTREAMERBASE definitions removed; retained consolidated GST with IMPORTED_TARGET
• Consolidated variables: All references updated to use GST_INCLUDE_DIRS and PkgConfig::GST instead of individual package variables
• Aligned with codebase pattern: Matches approach used in GstPlayer/CMakeLists.txt

Before:

pkg_check_modules(GSTREAMER REQUIRED gstreamer-1.0)
pkg_check_modules(GSTREAMERAPP REQUIRED gstreamer-app-1.0)
pkg_check_modules(GSTREAMERBASE REQUIRED gstreamer-base-1.0)
pkg_check_modules(GST REQUIRED IMPORTED_TARGET
    gstreamer-1.0
    gstreamer-base-1.0
    gstreamer-app-1.0
)
# ...
include_directories(${GSTREAMER_INCLUDE_DIRS})
include_directories(${GSTREAMERAPP_INCLUDE_DIRS})
include_directories(${GSTREAMERBASE_INCLUDE_DIRS})
# ...
target_link_libraries(... ${GSTREAMER_LINK_LIBRARIES} ${GSTREAMERAPP_LINK_LIBRARIES} ...)

After:

pkg_check_modules(GST REQUIRED IMPORTED_TARGET
    gstreamer-1.0
    gstreamer-base-1.0
    gstreamer-app-1.0
)
# ...
include_directories(${GST_INCLUDE_DIRS})
# ...
target_link_libraries(... PkgConfig::GST)

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