fix: support influxdb v1.8 HTTP error response message

[alxndrdude]

An influxdb v1.8 HTTP error response message was not correctly transferred to ruby InfluxError message. Hence, in case of an InfuxDB v1.8 Error response, the reason (except status code) was not traceable.

Closes #133

Proposed Changes

After parsing the response body of an InfuxDB Error response, the information of it is wrapped into an InfluxDB2::InfluxError.
Evaluation of the error message has to be different for InfluxDB v1.8 and InfuxDB v2.x, because the response body is different.

How the fix works:

• InfluxDB v2.x uses the message key for this
• InfluxDB v1.8 uses the error key for this

-> previously only message was supported
-> now, in case message is blank, error is checked

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• rake test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[bednar]

Hi @alxndrdude,

Thank you for your contribution and the effort you've put into this Pull Request 👍. It's great to see your involvement and the value you're adding to the project.

Before we can proceed with merging your PR, please ensure that all items on our checklist are satisfied. This step is crucial for maintaining the quality and consistency of the codebase. Once you've completed the checklist, we'll be more than ready to move forward with merging your changes.

If you have any questions about the checklist or need further clarification on any of the points, feel free to reach out.

Best Regards

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9eb5d8b) 48.23% compared to head (53df47b) 48.23%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #134   +/-   ##
=======================================
  Coverage   48.23%   48.23%           
=======================================
  Files          77       77           
  Lines        7948     7948           
=======================================
  Hits         3834     3834           
  Misses       4114     4114           

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[bednar]

Thanks again for your PR 👍

LGTM 🚀