[fenix] For https://github.com/mozilla-mobile/fenix/issues/19401 - Replace hard-coded hex color values with their respective photon color variable (https://github.com/mozilla-mobile/fenix/pull/19406)
* Replaced https://github.com/mozilla-mobile/fenix/issues/20123A with @color/photonInk80 in values\colors.xml
* Replaced #F9F9FB with @color/photonLightGrey10 in values\colors.xml
* Replaced #E0E0E6 with @color/photonLightGrey30 in values\colors.xml
* Replaced https://github.com/mozilla-mobile/fenix/pull/592ACB with @color/photonViolet70 in values\colors.xml
* Replaced https://github.com/mozilla-mobile/fenix/pull/312A65 with @color/photonInk20 in values\colors.xml
* Replaced #FBFBFE with @color/photonLightGrey05 in values\colors.xml
* Replaced #52525E with @color/photonDarkGrey10 in values\colors.xml
* Replaced #ffffff with @color/photonWhite in values\colors.xml
* Replaced https://github.com/mozilla-mobile/fenix/pull/5B5B66 with @color/photonDarkGrey05 in values\colors.xml
* Replaced https://github.com/mozilla-mobile/fenix/issues/1C1B22 with @color/photonDarkGrey80 in values\colors.xml
* Replaced #737373 with @color/photonGrey50 in values\colors.xml
* Replaced https://github.com/mozilla-mobile/fenix/issues/9059FF with @color/photonViolet50 in values\colors.xml
* Replaced https://github.com/mozilla-mobile/fenix/pull/5B5B66 with @color/photonDarkGrey05 in values-night\colors.xml
* Replaced https://github.com/mozilla-mobile/fenix/pull/3A3944 with @color/photonDarkGrey40 in values-night\colors.xml