fix(cli): allow --help to work without config file

[littleKitchen]

Summary

When running connectors <subcommand> --help without first running connectors login, users would see a confusing error about config.yml not being found. This PR fixes that by allowing help to work without authentication.

Changes

• Skip config loading when help flags (-h/--help) are present in command args
• Update error message to suggest running connectors login first (clearer guidance)
• Add tests verifying help works without config file

Testing

• All 2099 existing tests pass
• Added 6 new test cases for subcommand help without config

Before

$ connectors job --help
.cli/config.yml was not found. Make sure that the config is either present at the default location...

After

$ connectors job --help
Usage: connectors job [OPTIONS] COMMAND [ARGS]...
  Sync jobs management
Options:
  --help  Show this message and exit.
...

Fixes #3700

[cla-checker-service]

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[artem-shelkovnikov]

Hi @littleKitchen,

Thanks for your contribution! I will test it out, but can you in the meantime sign the Elastic CLA, so that we could proceed with merging this change in?