VPAAMP-406 suppress noisy logging

[pstroffolino]

Reason for Change: tame noisy aampcli logging

aampcli is logging every manifest refresh.
This is excessive - there are events for this, that include manifest size, but logging every few seconds is excessive. This should be moved to trace level or removed.
We also have warning level logs present for segment and manifest downloads - this appears to be accidentally included as part of the network persona support in aamp.
As warn level logs, it'll show up by default, spewing noise into logs.
Lastly, we have a longstanding behavior where aamp by default logs all info level log messages, and 'info' log level choice is only honored once tune is complete. This is normally fine, but we have tests involving suppressDecode where the tune never succeeds, and we don't necessarily care about constant spew of info level logs.
Here, propose new semantic where log=WARN will force suppression of info level logs, even at tune time

[Copilot]

Pull request overview

This PR aims to reduce noisy default logging (especially in aampcli and network-persona paths), and to make “quiet” log-level selections (WARN/MIL/ERROR) take effect even during tune start. It also adds an optional MP4 segment integrity monitor and improves macOS build robustness around GStreamer discovery/installation.

Changes:

• Suppress overly chatty aampcli manifest-refresh prints and comment out some accidental WARN-level persona download logs.
• Add monitorMp4Integrity config + per-track persistent Mp4Demux validators to detect and harvest corrupt MP4 segments.
• Adjust ConfigureLogSettings() so log=warn|mil|error locks the log level (preventing tune-time INFO elevation).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
test/aampcli/Aampcli.cpp	Removes noisy manifest refresh / manifest-size prints (currently via commented-out lines).
scripts/install_dependencies.sh	Ensures GStreamer is available on macOS (framework if present, else Homebrew install) to avoid pkg-config/CMake failures.
scripts/install_aampcli.sh	Makes macOS aampcli build pick GStreamer pkg-config paths from framework or Homebrew, with clearer errors.
priv_aamp.h	Adds MP4 integrity monitoring API + persistent per-track Mp4Demux members.
priv_aamp.cpp	Implements MP4 integrity parsing/dumping and suppresses a specific persona WARN log (commented out).
MediaStreamContext.cpp	Early-exits fragment injection when suppressDecode is enabled.
downloader/AampCurlDownloader.cpp	Suppresses a personaActive WARN log (commented out).
AampConfig.h	Adds new bool setting eAAMPConfig_MonitorMp4Integrity.
AampConfig.cpp	Registers monitorMp4Integrity and locks log level for `log=warn

Comments suppressed due to low confidence (1)

test/aampcli/Aampcli.cpp:689

• Same issue here: commented-out logging should be removed or controlled by a runtime verbosity/log-level toggle (e.g., trace) instead of being left in the codebase as dead code.

				{
					std::string manifest = mAampcli.mSingleton->GetManifest();
					//AAMPCLI_PRINTF("[AAMPCLI] Dash Manifest length [%zu]\n", manifest.length());
					break;