[STF] Rename task_fence to fence, and graph epochs to graph stages

[caugonnet]

Description

This PR only renames existing facilities

closes

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[caugonnet]

/ok to test f1d2bab

[caugonnet]

/ok to test 958322c

[github-actions]

🟩 CI finished in 30m 59s: Pass: 100%/32 | Total: 7h 28m | Avg: 14m 00s | Max: 30m 53s | Hits: 70%/16218

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👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
	CCCL Packaging
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	stdpar
	python
	CCCL C Parallel Library
	Catch2Helper

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
+/-	CCCL Packaging
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	stdpar
	python
	CCCL C Parallel Library
	Catch2Helper

🏃‍ Runner counts (total jobs: 32)

#	Runner
17	linux-amd64-cpu16
6	linux-amd64-gpu-rtx2080-latest-1
4	windows-amd64-cpu16
4	linux-arm64-cpu16
1	linux-amd64-gpu-h100-latest-1