Start Jersey TestContainer once per class vs. once per test method

[nscuro]

Description

Starts the Jersey TestContainer once per class vs. once per test method.

Reduces the time it takes to execute the entire test suite, since the Jersey context is not torn down and rebuilt from scratch as often.

Addressed Issue

Ports DependencyTrack/dependency-track#3668

Additional Details

N/A

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 updated the migration changelog accordingly
• 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%)	✅ ∅ (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (e188d99)	18050	14447	80.04%
Head commit (0a7e24b)	18050 (+0)	14445 (-2)	80.03% (-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 (#670)	0	0	∅ (not applicable)

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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[nscuro]

In DependencyTrack/dependency-track#3668 it shaved off 10min of test execution time (30min -> 20min). Here it appears to be 15min (last main build took ~48min, the build for this PR took ~32min)!

[sahibamittal]

LGTM 💯