Fix #344, add doc-prebuild dependency

[jphickey]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
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Describe the contribution
The documentation requires some artifacts to be in place, this added dependency ensures they are created before doxygen runs.

Fixes #344

Testing performed
Run documentation build

Expected behavior changes
No missing file if this is the first/only target built (file will be created due to dependency)

System(s) tested on
Ubuntu 22.04

Additional context
Requires merging nasa/cFE#2214 and nasa/osal#1341 before this will actually work.

Contributor Info - All information REQUIRED for consideration of pull request
Joseph Hickey, Vantage Systems, Inc.