Fix #104, Make padding explicit in `FM_MonitorReportEntry_t` & `FM_ChildQueueEntry_t`

[thnkslprpt]

Checklist

• [x] I reviewed the Contributing Guide.
• [x] I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution

• Fixes #104
  • Implicit padding being added in FM_MonitorReportEntry_t & FM_ChildQueueEntry_t has been made explicit

Testing performed GitHub CI actions all passing successfully (incl. Build + Run, Unit/Functional Tests etc.).

Expected behavior changes No change.

Contributor Info Avi Weiss @thnkslprpt