KC-1377: Add --format json support for various Commands

[sshrushanth-ks]

Summary

Added --format json support to whoami, trash get, pam rotation list, pam action job-list, pam action service list, pam action discover rule list, pam access user list, pam action discover status, pam tunnel list, pam action gateway-info, and pam action saas user.

Changes

• Replaced whoami --json with --format {text,json} and returned structured whoami/license info
• Added --format {detail,json} to trash get
• Added --format {table,json} to pam rotation list, pam action job-list, pam action service list, pam action discover rule list, pam action discover status, and pam tunnel list
• Added --format {text,json} to pam action gateway-info and pam action saas user
• Implemented pam access user list (via IdP group list + members) with --format {table,json}
• Emitted clean snake_case JSON payloads (no ANSI coloring); kept existing table/text defaults
• Fixed gateway context selection when --configuration-uid is provided for discovery commands
• Added unit coverage for whoami --format json