Fix usb_mic_task overrun by enforcing MIC_INTERVAL_MS pacing (AEGHB-1078)

[Ziamor]

Description

The usb_mic_task previously ran in a tight loop, pulling audio data as fast as possible. This caused USB audio to exceed the expected data rate, leading to glitches and distorted output. It also triggered the task watchdog due to lack of blocking.

This patch introduces vTaskDelayUntil() to enforce the configured MIC_INTERVAL_MS rate, ensuring correct USB audio pacing and RTOS compliance.

Related

• Fixes #511

Testing

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