Add new policy operator for checking if CPE or PURL not present

[2000rosser]

Description

This change adds a new PolicyCondition operator NOT_PRESENT which can be used with PURL or CPE to evaluate wether or not its present.

I am setting "NOT_PRESENT" forvalue in the frontend because allowsnull is false for value. Wouldn't be very intuitive if creating the condition using REST API, could we change it?

Addressed Issue

#4218

Additional Details

Front end PR DependencyTrack/frontend#1053

Checklist

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have added corresponding update logic
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.01% (target: -1.00%)	✅ 100.00% (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (55d5d2f)	22545	17849	79.17%
Head commit (3aa74ec)	22552 (+7)	17856 (+7)	79.18% (+0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4236)	7	7	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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