Limit SBR message id loops for reasonable test times

[skliper]

Is your feature request related to a problem? Please describe.
Loops over CFE_PLATFOR_SB_HIGHEST_VALID_MSGID can take a long time on some systems (many minutes). Unit tests that cover the full range for the default setting is sufficient to show proper operation.

cFE/modules/sbr/ut-coverage/test_cfe_sbr_map_direct.c

Lines 55 to 61 in c161cf0

	for (msgidx = 0; msgidx <= CFE_PLATFORM_SB_HIGHEST_VALID_MSGID; msgidx++)
	{
	if (!CFE_SBR_IsValidRouteId(CFE_SBR_GetRouteId(CFE_SB_ValueToMsgId(msgidx))))
	{
	count++;
	}
	}

cFE/modules/sbr/ut-coverage/test_cfe_sbr_map_direct.c

Lines 77 to 83 in c161cf0

	for (msgidx = 0; msgidx <= CFE_PLATFORM_SB_HIGHEST_VALID_MSGID; msgidx++)
	{
	if (!CFE_SBR_IsValidRouteId(CFE_SBR_GetRouteId(CFE_SB_ValueToMsgId(msgidx))))
	{
	count++;
	}
	}

cFE/modules/sbr/ut-coverage/test_cfe_sbr_map_hash.c

Lines 74 to 80 in c161cf0

	for (msgidx = 0; msgidx <= CFE_PLATFORM_SB_HIGHEST_VALID_MSGID; msgidx++)
	{
	if (!CFE_SBR_IsValidRouteId(CFE_SBR_GetRouteId(CFE_SB_ValueToMsgId(msgidx))))
	{
	count++;
	}
	}

Describe the solution you'd like
Limit the loops.

Describe alternatives you've considered
None

Additional context
None

Requester Info
Jacob Hageman NASA/GSFC

@excaliburtb