[nemo][embedlite-components] Disable json messages from history changes. Contributes to JB#39908
[nemo][embedlite-components] Align EmbedHistoryListener with Android FF's nsAndroidHistory. Contributes to JB#39908
[nemo][embedlite-components] Improve user-agent override handling. Contributes to JB#39252
[nemo][embedlite-components] Clear selection marker if selection fails. Fixes JB#39003
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