Fix #133, Update references to CFE_FS_Header_t time members

[thnkslprpt]

Describe the contribution

• Fixes References to time members in CFE_FS_Header_t should be converted to CFE_TIME_SysTime_t #133
  • References to the CFE_FS_Header_t file create time members are updated to go through to the CFE_TIME_SysTime_t substruct.

Testing performed
GitHub CodeqL tasks failing to build because this goes along with updates to cFE: nasa/cFE#2246

Local testing confirms all working together successfully when both changes implemented together. 100% of tests passing and net coverage unaffected.

Expected behavior changes
No change to behavior.

System(s) tested on
Intel(R) Celeron(R) N4100 CPU @ 1.10GHz x86_64
Debian GNU/Linux 11 (bullseye)
Current main branch of cFS.

Contributor Info
Avi Weiss @thnkslprpt

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