fix: `connection` name for used handler

[michalsn]

Description This PR fixes the connection name we set in the queue_jobs_failed table. Now the name is properly set, depending on the used handler.

Checklist:

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

[coveralls]

Pull Request Test Coverage Report for Build 7434208947

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 87.433%

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Totals
Change from base Build 7357997125:	0.07%
Covered Lines:	487
Relevant Lines:	557

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💛 - Coveralls

[michalsn]

Thank you!