VPLAY-12061:Closed captioning issues after introducing webvTT along with inBand CC tracks

[Gnanesha]

VPLAY-12061:Closed captioning issues after introducing webvTT along with inBand CC tracks

Reason for change: filter out the webvtt tracks before sending the list of tracks to application
Test Procedure: see ticket
Risks: Low

[Copilot]

Pull request overview

This PR adds a configuration flag to disable WebVTT subtitle tracks so that only in-band closed caption (CC) tracks are exposed to applications, addressing mixed WebVTT/in-band CC behavior.

Changes:

• Introduced a new boolean config eAAMPConfig_DisableWebVTT (key disableWebVTT) with default false.
• Updated PrivateInstanceAAMP::Tune to automatically enable disableWebVTT for the “peacock” app by default.
• Updated PrivateInstanceAAMP::GetAvailableTextTracks to filter out non-CC (WebVTT) tracks when disableWebVTT is set, and added a unit test intended to verify that only CC tracks are returned.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
priv_aamp.cpp	Uses eAAMPConfig_DisableWebVTT in GetAvailableTextTracks to restrict the returned list to CC-only when enabled, and configures disableWebVTT by default for the Peacock app in Tune.
AampConfig.h	Adds the eAAMPConfig_DisableWebVTT enum entry to the boolean config list.
AampConfig.cpp	Registers the new disableWebVTT boolean setting in the boolean config lookup table with default false.
test/utests/tests/PrivateInstanceAAMP/ClosedCaptionTests.cpp	Adds a new unit test targeting the disableWebVTT behavior for GetAvailableTextTracks (though current expectations still assume all tracks are serialized).