How to reproduce:
1. Open "case_1260278-BugRepo" project
2. Open the Memory Profiler
3. Press "Capture Editor"
4. Enter Play Mode
5. When the Play Mode is loaded, exit the Play Mode
6. Press "Capture Editor" again in the Memory Profiler
7. Open 2 most recent snapshots
8. Click on the older snapshot, and open the RenderTexture category
9. Observe the number of objects that have 0 references (RefCount)
10. Check Render Texture objects that have 0 references for the newer snapshot

Expected result: The newer snapshot has no new RenderTexture objects
Actual result: The newer snapshot has new Render Texture objects

Reproducible with: 2019.4.1f1 (7.4.1)

Notes:
- This only happens on the users modified URP package
- The User noticed that Dispose() was not being called when the Editor exited the Play Mode. A renderTexture was added that showed up in the memory profiler as a leak.
- After adding some breakpoints in UniversalRenderPipelineAsset for CreateRenderers() and Dispose() in ForwardRenderer it appears that when we exit out of Play Mode we are not calling DestroyRenderers() but we do initialize a new renderer, before destroying the previous one.