feat: print all errors in dev reader

[dundee]

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What this PR does / why we need it

When service is being run locally (without devenv) and no config is present, the message says:

open /run/config/outreach.io/<service>.yaml: no such file or directory

Which is misleading as it doesn't say that the logic actually tried also paths in ~/.outreach.

With this PR it will show all the attempts if devReader fails:

failed to read config file "<SERVICE>.yaml": open /Users/danielmilde/.outreach/<SERVICE>/<SERVICE>.yaml: no such file or directory
failed to read config file "<SERVICE>.yaml": open /Users/danielmilde/.outreach/<SERVICE>.yaml: no such file or directory
{"@timestamp":"2024-12-05T13:51:22.988722+01:00","app.name":"<SERVICE>","app.version":"148390f","error.error":"failed to read config file \"<SERVICE>.yaml\": open /run/config/outreach.io/<SERVICE>.yaml: no such file or directory","error.kind":"error","error.message":"failed to read config file \"<SERVICE>.yaml\": open /run/config/outreach.io/<SERVICE>.yaml: no such file or directory","level":"ERROR","message":"failed to load config","module":"github.com/getoutreach/<SERVICE>","modulever":"148390f","service_name":"<SERVICE>"}

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