Dev/olivierdubo/issues autocomplete

[duboolivier]

Description

Added shell autocompletion for the --cloud-project flag across all ovhcloud cloud subcommands. When pressing TAB after --cloud-project, the CLI queries the OVHcloud API and displays the list of available project IDs with their descriptions. A new ovhcloud completion install command automatically sets up completion in the user's shell (~/.bashrc or ~/.zshrc) without any manual configuration.

Fixes #xx (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (improvement of existing commands)
• Breaking change (fix or feature that can break a current behavior)
• Documentation update

Checklist:

• My code follows the style guidelines of this project
• I have commented my code
• I ran go mod tidy
• I have added tests that prove my fix is effective or that my feature works