Fix DbUtil not being initialized

[nscuro]

Description

Fixes DbUtil not being initialized.

Some legacy code ported over from v4 still uses DbUtil#isPostgreSQL checks to determine if certain SQL syntax can be used.

Since our move to Liquibase, DbUtil has not been initialized anymore, and hence always returned false for the aforementioned check.

Ultimately, usages of DbUtil should be removed entirely.

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 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
✅ +0.00% (target: -1.00%)	✅ 100.00% (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (aced98e)	22391	18569	82.93%
Head commit (f2c5e89)	22393 (+2)	18571 (+2)	82.93% (+0.00%)

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 (#1058)	2	2	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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