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Suppress AJAX errors caused by browser navigation

Nathan Friend requested to merge nfriend-dont-show-error-messages-on-browser-navigation into master

What does this MR do?

Attempts to detect when AJAX errors are caused by browser navigation and suppress the error. This hides the warnings that often show in Firefox when leaving the page as described in #66048 (moved).

This change is hidden behind the suppress_ajax_navigation_errors feature flag and is disabled by default. A unit test will be written for this feature in a separate MR; this MR will also update the feature flag to be enabled by default.

Closes #66048 (moved)

Edited by Nathan Friend

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