ci-demand: four lines no test catches (private-cache refusal, fallback reserve, two UTF-8 settings) #121

Four lines in ci-demand can be removed or broken without any test failing (found by breaking lines on purpose):

• the refusal when the cache folder cannot be made private;
• the fallback rate-limit reserve when GitHub does not send the limit;
• the UTF-8 setting for gh output;
• the UTF-8 setting for reading the config file.

Fix: add one test for each that fails without the line.

From the quick-check review of #113: #113 (comment)

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