RDKEMW-13074: Integration of LLM team provided test cases in middleware interface player

[ALSAMEEMA]

No description provided.

[Copilot]

Pull request overview

This PR integrates a large set of LLM-team-provided unit tests into the middleware player interface test suite, expands coverage across several modules (Subtec, IsoBmff, externals, content security, closed captions), and adjusts test build configuration to compile and run the new/updated tests.

Changes:

• Reworked/added extensive GoogleTest suites for Subtec PacketSender, Player externals interfaces (Thunder/RFC/ExternalsInterface/Base/Utils), ContentSecurityManager session + memory utils, and CC track info.
• Updated multiple utest CMakeLists.txt to include new sources and adjust include paths / linked sources.
• Minor correctness tweaks in existing IsoBmff tests (buffer header expectations and sample-count initialization).

Reviewed changes

Copilot reviewed 24 out of 37 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
test/utests/tests/SubtecTests/PacketSenderTests.cpp	Replaces skipped/basic tests with a comprehensive PacketSender + runWorkerTask test suite.
test/utests/tests/SubtecTests/CMakeLists.txt	Adds include dirs and new test source(s); links additional player sources needed by new tests.
test/utests/tests/PlayerIsoBmffTests/PlayerIsoBmffBufferTests.cpp	Adjusts nested container buffer expectations (mvhd size bytes).
test/utests/tests/PlayerIsoBmffTests/PlayerIsoBmffBoxTests.cpp	Improves Senc/Saiz truncate tests by initializing sample count in buffer and adding extra assertions.
test/utests/tests/PlayerIsoBmffTests/CMakeLists.txt	Updates include directories for IsoBmff utests.
test/utests/tests/PlayerExternalsTests/PlayerThunderInterfaceTests.cpp	Adds comprehensive unit tests for PlayerThunderInterface (FakeThunderAccess behavior).
test/utests/tests/PlayerExternalsTests/PlayerRFCTests.cpp	Adds unit tests validating RFC disabled-mode behavior (empty string returns).
test/utests/tests/PlayerExternalsTests/PlayerExternalUtilsTests.cpp	Adds tests for IsContainerEnvironment and ms_sleep.
test/utests/tests/PlayerExternalsTests/PlayerExternalsInterfaceTests.cpp	Adds tests for FakePlayerExternalsInterface and PlayerExternalsInterface singleton APIs.
test/utests/tests/PlayerExternalsTests/PlayerExternalsInterfaceBaseTests.cpp	Adds tests for PlayerExternalsInterfaceBase via a concrete test subclass.
test/utests/tests/PlayerExternalsTests/CMakeLists.txt	Replaces old “Fun.cpp” sources with new test files and adjusts include directories.
test/utests/tests/DrmOcdmTests/CMakeLists.txt	Small formatting/line-fix in test runner macro invocation.
test/utests/tests/ContentsecuritymanagerTests/PlayerMemoryUtilsTests.cpp	Adds extensive tests for shared memory create/cleanup APIs and lifecycle/stress scenarios.
test/utests/tests/ContentsecuritymanagerTests/ContentSecurityManagerSessionTests.cpp	Adds comprehensive tests for ContentSecurityManagerSession constructors/copy/validity/toString.
test/utests/tests/ContentsecuritymanagerTests/CMakeLists.txt	Replaces older test source list with new test suites and adjusts include directories.
test/utests/tests/ClosedCaptionsTests/PlayerCCTrackInfoTests.cpp	Replaces minimal CCTrackInfo test with a large enhanced suite (copy/edge/stress/thread tests).
test/utests/tests/ClosedCaptionsTests/CMakeLists.txt	Minor formatting/indent adjustments in test source list.
externals/PlayerExternalsInterface.h	Adds createInstance() API declaration for non-singleton instance creation.
externals/PlayerExternalsInterface.cpp	Implements PlayerExternalsInterface::createInstance().

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