Review Mozilla 1947801: Add OHTTP flag to WebExecutor

🔍 Bugzilla Audit

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1947801

d090fd72 conflicted with 13341e96.

The upstream bug is about cookie jars being skipped for OHTTP and Glean stuff.

For us it becomes the place where to add origin information for stream isolation.

So, extremely important. This is super blocker imho.

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