Refactor config dependent conditional in hs_custom.c

[skliper]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I reviewed the README file to see if the feature is in the major future work.
• I performed a cursory search to see if the feature request is relevant, not redundant, nor in conflict with other tickets.

Is your feature request related to a problem? Please describe.
Can't cover branch when HS_UTIL_CALLS_PER_MARK is 1 (since the counter is static local):

HS/fsw/src/hs_custom.c

Lines 180 to 195 in 2fc0dd9

	void HS_UtilizationMark(void)
	{
	static uint32 CycleCount = 0;
	CycleCount++;
	if (CycleCount >= HS_UTIL_CALLS_PER_MARK)
	{
	HS_CustomData.LastIdleTaskInterval = HS_CustomData.ThisIdleTaskExec - HS_CustomData.LastIdleTaskExec;
	HS_CustomData.LastIdleTaskExec = HS_CustomData.ThisIdleTaskExec;
	CycleCount = 0;
	}
	return;
	} /* end HS_UtilizationMark */

Describe the solution you'd like
Use the custom global to store config such that it can be set to get full coverage.

Describe alternatives you've considered
None

Additional context
None

Requester Info
Jacob Hageman - NASA/GSFC