🎥 [story-ads] respect video duration from ads

### Description

As we look to enable auto-advance more generally we should make sure videos ads duration are respected. To limit abuse we will set the `auto-advance = min(15s, videoDuration)`

This can be in 2 parts
1. FIE support -- We have direct access to video element
2. Inabox support -- We will need the inabox runtime to postMessage the story. The story will need to listen for this message and respond by setting the limit.

### Reproduction Steps

n/a

### Relevant Logs

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### Browser(s) Affected

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### OS(s) Affected

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### Device(s) Affected

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### AMP Version Affected

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