Remove coveralls badge

[Licenser]

Pull request

Description

We moved to codecov, coveralls is no longer reflecting the reality of our coverage.

Related

Checklist

• The RFC, if required, has been submitted and approved
• Any user-facing impact of the changes is reflected in docs.tremor.rs
• The code is tested
• Use of unsafe code is reasoned about in a comment
• Update CHANGELOG.md appropriately, recording any changes, bug fixes, or other observable changes in behavior
• The performance impact of the change is measured (see below)

Performance

no impact

[codecov]

Codecov Report

Merging #1676 (d5b3fb5) into main (1c36f98) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1676      +/-   ##
==========================================
- Coverage   56.15%   56.10%   -0.06%     
==========================================
  Files         243      243              
  Lines       37017    37017              
==========================================
- Hits        20787    20768      -19     
- Misses      16230    16249      +19     

Flag	Coverage Δ
clicommand	14.45% <ø> (+0.01%)	⬆️
cliintegration	52.36% <ø> (-0.06%)	⬇️
cliunit	13.39% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/connectors/utils/metrics.rs	92.39% <0.00%> (-2.18%)	⬇️
tremor-pipeline/src/lib.rs	47.50% <0.00%> (-2.14%)	⬇️
tremor-cli/src/test/process.rs	71.34% <0.00%> (-1.22%)	⬇️
src/connectors/impls/kafka/producer.rs	71.84% <0.00%> (-1.09%)	⬇️
src/connectors/sink.rs	78.54% <0.00%> (-0.63%)	⬇️
src/pipeline.rs	82.27% <0.00%> (-0.34%)	⬇️
src/connectors/source.rs	85.36% <0.00%> (ø)
tremor-cli/src/test/before.rs	77.77% <0.00%> (ø)
src/connectors/impls/kafka/consumer.rs	73.41% <0.00%> (+0.19%)	⬆️

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