Remove attribute conflict validation for 'cves' and 'vulnerabilities'

[alexhung]

Also remove 'Computed' attribute for 'cves'. Practitioners need to set "any" if 'vulnerabilities' is also set to 'any' to avoid state drift.

Update documentation for the same.

Closed #148

[github-actions]

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[alexhung]

@danielmkn Tests pass acceptance tests now. It's kinda odd...