[8.2] Prevent ThreadContext header leak when sending response (#68649) #85860
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We need to stash thread context in DefaultRestChannel before we call channel.sendResponse because when calling this method, our execution might be delayed and the thread be reused for another task - like sending another response. And it would see thread context from the initial “delayed” work. This commit also expands the assertions on the empty thread context to make sure it does not contains response headers. closes elastic#68278
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Backports the following commits to 8.2: