Add auto-collapse capability to pinned messages based on timeout provided by bannerProperties

[FlaminSarge]

This also updates the impl in ChatSummary, and adds a fix for responseIsAction for summary (in case YT ever starts sending summary in liveChatContinuation instead of initial data).
Note that in all cases, the behavior is auto-collapse instead of YT's default behavior of removing certain banners entirely after the time expires.

bannerProperties exists both on the top-level object as well as inside the liveChatBannerRenderer.
This impl does the following:

• Get top-level isEphemeral.
• If true, use top-level bannerTimeoutMs, or 0 if not present, and return.
• If false, use top-level autoCollapseDelay, or liveChatBannerRenderer autoCollapseDelay if not present, or 0 if also not present, and return.

In stock YT, Redirects and AI Chat Summary use the top-level properties with isEphemeral=true and bannerTimeoutMs, and pinned chat messages use the inner object with just autoCollapseDelay.
AI Chat Summary also has an inner object with isEphemeral=true and autoCollapseDelay, but it never seems to get used by stock YT, and has a 30-second value instead of the 12 seconds of the top-level properties (the actual behavior uses 12 seconds).

Tested on mv3/chrome