Enable reWriteBatchedInserts Postgres JDBC driver option in tests

[nscuro]

Description

As per JDBC driver documentation (https://jdbc.postgresql.org/documentation/use/):

This will change batch inserts from insert into foo (col1, col2, col3) values (1, 2, 3) into insert into foo (col1, col2, col3) values (1, 2, 3), (4, 5, 6) this provides 2-3x performance improvement

Indeed, per default even batched JDBC statements are executed one-by-one, somewhat defeating the purpose of batching in the first place. This option allows us to get the true benefit out of performing batch operations.

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

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Coverage summary from Codacy

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Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅ (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (0d087e1)	21412	17650	82.43%
Head commit (a699c80)	21412 (+0)	17650 (+0)	82.43% (+0.00%)

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Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#917)	0	0	∅ (not applicable)

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