User:User-12316399/Simple asset fixes

A work in progress list of block and item asset related fixes that could easily be made to. Most are reported by me.

Unused pixels
All of these are incredibly easy fixes, as the fixed versions of the textures are attached to the tickets and therefore can simply replace Java Edition's existing texture files. The exception is MC-251254, as its fix is attached to instead (and therefore replacing the vanilla texture with the fixed texture would fix both MC-251254 and MC-262632).
 * - End rod
 * - Hopper top
 * - Hopper side
 * - Cauldron side
 * - Cauldron bottom
 * - Cauldron top
 * - Item frame, glow item frame
 * - Beacon
 * - Brewing stand base
 * - Tripwire
 * - Chorus plant, chorus flower, dead chorus flower