Remove unnecessary restrictions

[zvr]

Now that spec-parser processes and check external property restrictions, the following warnings were generated:

WARNING: In class /AI/AIPackage property /Core/Artifact/releaseTime has same maxCount as the parent class
WARNING: In class /AI/AIPackage property /Core/Artifact/suppliedBy has same maxCount as the parent class
WARNING: In class /AI/AIPackage property /Software/Package/downloadLocation has same maxCount as the parent class
WARNING: In class /AI/AIPackage property /Software/Package/packageVersion has same maxCount as the parent class
WARNING: In class /AI/AIPackage property /Software/SoftwareArtifact/primaryPurpose has same maxCount as the parent class
WARNING: In class /Dataset/DatasetPackage property /Core/Artifact/builtTime has same maxCount as the parent class
WARNING: In class /Dataset/DatasetPackage property /Core/Artifact/releaseTime has same maxCount as the parent class
WARNING: In class /Dataset/DatasetPackage property /Software/Package/downloadLocation has same maxCount as the parent class
WARNING: In class /Dataset/DatasetPackage property /Software/SoftwareArtifact/primaryPurpose has same maxCount as the parent class
WARNING: In class /Security/VulnAssessmentRelationship property /Core/Relationship/to has same minCount as the parent class

This PR removes these unnecessary external property restrictions.

[kestewart]

@rgopikrishnan91 - please review.

[bact]

Discussed in 2024-07-16 Tech team meeting, agree to merge.

[goneall]

LGTM - based on comments, was approved during tech call - merging