The only fallout from part 1 is a single test where we run `evaluateJS` on a session, serialize it to a `Parcel`,
deserialize it to new, distinct `GeckoSession` object, and then perform additional `evaluateJS` on the latter.
Since the deserialization of the `Parcel` transferred the session's contents from the original session to the new
session, we also need to transfer the `WebExtension.Port` used by `evaluateJS` to the new session.
Note that this fix is kind of hacky, but because we are going to deprecate the parcelability of `GeckoSession`, I
do not believe that it is worth the effort to implement a "perfect" fix; that would likely involve adding new APIs
to support another API that we are going to deprecate anyway.
Depends on D81746
Differential Revision: https://phabricator.services.mozilla.com/D81748
8676c67cef