Revert "Move `add_breadcrumb` and session function from Hub to Scope … #4354

Job	Run time
asgi pinned, python 3.7, ubuntu-20.04	44s
asgi pinned, python 3.8, ubuntu-20.04	43s
asgi pinned, python 3.9, ubuntu-20.04	45s
asgi pinned, python 3.10, ubuntu-20.04	52s
asgi pinned, python 3.11, ubuntu-20.04	37s
asgi pinned, python 3.12, ubuntu-20.04	1m 3s
All asgi tests passed or skipped	1s
	4m 45s

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