Fix #1397, Rename overloaded `EVS_PacketID_t` to `EVS_EventContext_t` #1639

Job	Run time
checks-for-duplicates	4s
Custom checkout and cache for cFS documents	10s
Build and deploy cFE Docs / checks-for-duplicates	6s
Build Mission Doc / checks-for-duplicates	6s
Build Mission Doc / Build Documentation (mission-doc)	1m 44s
Build and deploy cFE Docs / Build Documentation (cfe-usersguide)	58s
Deploy documentation to gh-pages	0s
	3m 8s

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