Handle newline characters in form parameters correctly with openqa-client

[kraih]

This makes openqa-client ... jobs/1/comment post $'text=test\n\n123' work. This is now required because proper Markdown requires newlines where previously raw HTML tags like <br> could be used in comments.

Progress: https://progress.opensuse.org/issues/55751

[codecov]

Codecov Report

Merging #2272 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2272      +/-   ##
==========================================
+ Coverage    86.1%   86.12%   +0.01%     
==========================================
  Files         166      166              
  Lines       10833    10833              
==========================================
+ Hits         9328     9330       +2     
+ Misses       1505     1503       -2

Impacted Files	Coverage Δ
lib/OpenQA/Worker/WebUIConnection.pm	81.9% <0%> (-2.52%)	⬇️
lib/OpenQA/Worker/Settings.pm	98.11% <0%> (+13.2%)	⬆️

---

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[codecov]

Codecov Report

Merging #2272 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2272      +/-   ##
==========================================
+ Coverage    86.1%   86.12%   +0.01%     
==========================================
  Files         166      166              
  Lines       10833    10833              
==========================================
+ Hits         9328     9330       +2     
+ Misses       1505     1503       -2

Impacted Files	Coverage Δ
lib/OpenQA/Worker/WebUIConnection.pm	81.9% <0%> (-2.52%)	⬇️
lib/OpenQA/Worker/Settings.pm	98.11% <0%> (+13.2%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #2272 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2272      +/-   ##
==========================================
+ Coverage    86.1%   86.12%   +0.01%     
==========================================
  Files         166      166              
  Lines       10833    10833              
==========================================
+ Hits         9328     9330       +2     
+ Misses       1505     1503       -2

Impacted Files	Coverage Δ
lib/OpenQA/Worker/WebUIConnection.pm	81.9% <0%> (-2.52%)	⬇️
lib/OpenQA/Worker/Settings.pm	98.11% <0%> (+13.2%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9af3c92...621fa0f. Read the comment docs.