Build emulator without access to Avito internals

[dsvoronin]

• build non-hermetic emulator without avito internal access
• extract BuildEmulator, only publishing was available
• script to simplify a process a bit

[dsvoronin]

Hey, Is there any blockers to merge it? shouldn't affect any internal builds to my knowledge

[sboishtyan]

We will merge it internally and it will sync from internal repo to develop