Fix logging in development and in background workers

[Floppy]

• Enabled MANYFOLD_LOG_LEVEL in development environments
• Set same log level in sidekiq workers as in main app
• Make MANYFOLD_LOG_LEVEL case insensitive

Resolves #5382

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

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

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6f85c10)	6088	5147	84.54%
Head commit (911af23)	6088 (+0)	5147 (+0)	84.54% (+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 (#5482)	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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