Skip Checkstyle for Jetty and DataNucleus Enhance run configs

[nscuro]

Description

Skips Checkstyle for Jetty and DataNucleus Enhance run configs.

These configs are used frequently in development workflows, so the additional delay caused by checkstyle quickly adds up.

Instead, introduce a dedicated Checkstyle run configuration for quickly testing if the code conforms to standards.

Also, remove legacy Jetty config and replace it with the previous Jetty with PostgreSQL config.

Addressed Issue

N/A

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 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
✅ -0.04% (target: -1.00%)	✅ ∅ (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (e1daf9a)	18010	14419	80.06%
Head commit (959ae15)	18010 (+0)	14412 (-7)	80.02% (-0.04%)

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 (#657)	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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