Make logstash submissions quieter

[msimberg]

• Only show errors, not progress, when curling to logstash
• Ignore errors when submitting to logstash (as a failure in submission shouldn't affect the pass/fail of the job as a whole; we don't mind if some submissions fail)

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.09% (target: -1.00%)	:white_check_mark: ∅ (target: 90.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (9d640327b1fce6077e75ff1c71dc02402b76906e) | 18369 | 13718 | 74.68% | | | Head commit (26fd3fe98e9eafc0e1f2c75085d5d02baf9988da) | 18369 (+0) | 13734 (+16) | 74.77% (**+0.09%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#1226) | 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: `/ * 100%`

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