Prepare switch to mozilla85 for mobile

• tor-browser-bundle-testsuite#40014 (closed)
• android-components#40033 (closed)
• android-components#40034 (closed)
• android-components#40036 (closed)
• fenix#40130 (closed)
• fenix#40131 (closed)
• fenix#40132 (closed)
• fenix#40134 (closed)
• tor-browser-build#40190 (closed)
• tor-browser-build#40191 (closed)
• #40276 (closed)
• #40277 (closed)
• #40278 (closed)
• #40279 (closed)
• #40280 (closed)
• #40293 (closed)
• tor-browser-spec#40012 (closed)
• torbutton#40027 (closed)