Disable strict mode for transactions

[michalsn]

Description
This PR ensures that the queue uses the correct connection group defined in the config file and disables strict mode for transactions. Due to the nature of the queue worker (a long-running process), we don't want one failed transaction to affect others.

Needs #49

Fixes: #41

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[coveralls]

Pull Request Test Coverage Report for Build 10989084030

Details

• 14 of 14 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.9%) to 90.317%

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Totals
Change from base Build 10938598555:	2.9%
Covered Lines:	513
Relevant Lines:	568

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💛 - Coveralls