Add support for NWB schema 2.7.0 #771

Job	Run time
linux-gallery-python3.8-minimum	2m 10s
linux-gallery-python3.11-upgraded	2m 21s
windows-gallery-python3.8-minimum	3m 3s
linux-python3.8-minimum	3m 22s
windows-gallery-python3.11-upgraded	3m 18s
linux-python3.11-upgraded	3m 5s
windows-python3.8-minimum	4m 49s
windows-python3.11-upgraded	4m 6s
macos-python3.8-minimum	4m 49s
conda-linux-gallery-python3.11-ros3	2m 23s
conda-linux-python3.11-ros3	1m 53s
conda-linux-python3.8-minimum	4m 0s
conda-linux-python3.11-upgraded	3m 14s
Deploy pre-release from dev	0s
	42m 33s

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