Earpiece switcher and overlay

[robintown]

A couple things still need doing here:

• Write tests
  • move mediaDevice test to callViewModel
• Remove the controls API for toggling the earpiece switcher, which we no longer need
• Split the header out into another PR, maybe?
• Modernize the new context
• Force dark theme for the overlay (and also the header and footer, when it is active)
  • The light theme looks very correct to me when the phone is in light theme mode (this is tbd)
  • Let's ask Aaron
  • Result: We do the same then what we do with emoji and settings overlays: dark overlay in light and dark theme
    This requires us to also swap the icon colors for the header bar icons
  • Result V2: we are fine with the inconsistency between modal background darkening and earpiece overlay lightening
• Fix android designs (video goes to top of the bar)
• Fix hover border being clipped
• Fix header being shown in PiP
• Only present the fast toggling UX in case either the Earpiece speaker or the Main speaker are selected
  • The fast toggling UX is only toggling between Earpiece and Main speaker
  • We also consider always showing the toggles but making them actions (shows what will happen when pressed instead of the current state) This is currently implemented in the pr as of: df3f962
  • This might be not enough: we also need to make sure to always show the button (even if in bluetooth mode)
• landscape should hide the header for now
• Update Element Web version used for end-to-end tests to a version that includes Allow Element Call to learn the room name element-web#30213

Potential candidates for a follow up PR

• fix android designs OneOnOneLayout (so that the app_bar overlays the video and but the floating tile does still respect the bounds)
• fix OneOnOneLayout Landscape (currently the app bar is not visible in this mode.

Closes #3271

[robintown]

@fkwp This is now ready for testing! Expect to see two headers on mobile until we get to the EX tasks listed in https://github.com/element-hq/voip-internal/issues/360