✨ Add Snigel to RTC callout vendors (ampproject#36334)

* [SN-3414]: Add Snigel to RTC callout vendors

* [SN-3414]: Fix lint's prettier/prettier error

Enable sticky ad as auto ads config (ampproject#36285)

Stop appending '; codecs=h264' to H.264/AVC video sources (ampproject…

…#36361)

(cherry picked from commit 5fed125)

✅ ♻️ Merge test helpers files (ampproject#35985)

* reorganize test helper files. disable local/query-selector lint rule in testing directory

* rename service-helpers to service

📖 `bento-selector` Create the README.md documentation. (ampproject#36324

)

* [`bento-selector`] Add README.md for selector.

* [`bento-selector`] Populate the content for README.md.

* [`bento-selector`] Respond to PR comments.

Sorting ad RTC vendor list (ampproject#36328)

increase timeout for test-amp-video-analytics test (ampproject#36323)

✨ Include a random eventid to associate CLS over a page session (ampp…

…roject#36289)

update validator workspaces (ampproject#36272)

* cl/400108044 Update validator rules_cc location, move protobuf_deps()

* cl/400304559 github commit msg missing or malformed

📖 Updated wrong teaser text for amp-call-tracking extension

The current teaser text for amp-call-tracking specifies that it displays gltf 3d models. I have used the first sentence from the usage section.