Show a warning dialog about charges when user starts a video call

The user starts a video call a warning dialog shall be presented.
If the user presses "OK" with the "Do not show again" box selected,
the dialog shall not be presented anymore.

Test: manual - Verified that a warning dialog about charges is shown
when a video call is started if
KEY_SHOW_VIDEO_CALL_CHARGES_ALERT_DIALOG_BOOL is true.

This is an upstream change from:
https://android-review.googlesource.com/c/platform/packages/apps/Dialer/+/518977/8

Bug: 67832837
Test: partner manual test
PiperOrigin-RevId: 188103414
Change-Id: I62628a32557297acaef096db90d2ddf049ef5017