Fix pipeline setup async requests executing at pipeline teardown

[smudri85]

Summary: Fix pipeline setup async requests executing at pipeline teardown.
Type: Fix
Test Plan: UT/CT, Fullstack
Jira: RDKEMW-21388

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Type: Feature/Fix/Cleanup
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[Copilot]

Pull request overview

This PR fixes a teardown-time lifetime issue in the GStreamer generic player path by ensuring objects captured for async worker-thread tasks remain valid until the task is destroyed, preventing setup-time callbacks/tasks from accessing freed GStreamer objects during pipeline teardown.

Changes:

• Take/own GStreamer references at scheduling time (gstObjectRef + gstCapsCopy) and release them in task destructors.
• Add a m_workerThread guard in updatePlaybackGroup to avoid queuing work when the worker thread is unavailable.
• Update unit tests to reflect the new ref/unref and caps-copy behavior, including a new null-caps test.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
media/server/gstplayer/source/GstGenericPlayer.cpp	Refs element/typefind, copies caps, and guards enqueueing based on worker thread presence.
media/server/gstplayer/source/tasks/generic/DeepElementAdded.cpp	Releases the scheduled element reference in the task destructor.
media/server/gstplayer/source/tasks/generic/UpdatePlaybackGroup.cpp	Releases the scheduled typefind reference and owned caps copy in the task destructor.
tests/unittests/media/server/gstplayer/genericPlayer/GstGenericPlayerTest.cpp	Expects gstObjectRef for deep-element scheduling.
tests/unittests/media/server/gstplayer/genericPlayer/GstGenericPlayerPrivateTest.cpp	Expects typefind ref + caps copy; adds coverage for null caps.
tests/unittests/media/server/gstplayer/genericPlayer/common/GenericTasksTestsBase.cpp	Updates expectations for destructor-time unrefs for tasks constructed in tests.
tests/unittests/media/server/gstplayer/genericPlayer/tasksTests/GenericPlayerTaskFactoryTest.cpp	Updates factory-task tests for new destructor unref behavior.

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[github-actions]

Coverage statistics of your commit:
Lines coverage stays unchanged and is: 84.3%
Functions coverage stays unchanged and is: 92.7%

[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

[github-actions]

Coverage statistics of your commit:
Lines coverage stays unchanged and is: 84.3%
Functions coverage stays unchanged and is: 92.7%

[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 4 comments.

[github-actions]

Coverage statistics of your commit:
Lines coverage stays unchanged and is: 84.3%
Functions coverage stays unchanged and is: 92.7%

[github-actions]

Coverage statistics of your commit:
Lines coverage stays unchanged and is: 84.3%
Functions coverage stays unchanged and is: 92.7%