There is no dedicated folder for the two 'beam' textures in assets/minecraft/textures/entity

There is no dedicated folder for the two 'beam' textures beacon_beam.png and end_gateway_beam.png. This is unusual when compared to other entities that have multiple textures, where both are stored together in their own sub folder for organization and clarity to help resource pack artists.

Steps to Reproduce:

1. Go to the following file path:
   C:\Users[user]\AppData\Roaming\.minecraft\versions[latest_version]
2. Right click the [version].jar] file, and open it in a file explorer (like 7zip or winrar)
3. Go to the following path inside the jar:
   assets\minecraft\textures\entity

Notes:

guardian_beam.png has not been included in this issue because of MC-271362, where it would be better suited to be placed with the other guardian textures.