fix(errors): honor caller exit code in Fatal

[Rahulatram321]

Description

This PR fixes exit-code handling in pkg/errors.Fatal so command-level callers can reliably control process exit status.

Problem

Fatal(exitcode, args...) currently uses log.Fatal(args...), which already exits with code 1.
That means the subsequent os.Exit(exitcode) is effectively unreachable for non-1 exit semantics, and caller-provided exit codes are not honored.

Changes

In pkg/errors/error.go:

• Replaced log.Fatal(args...) with log.Println(args...)
• Kept explicit os.Exit(exitcode)

Result

• Error is still logged.
• Process exits using the caller-provided code, restoring expected CLI behavior for scripts/CI that rely on specific status codes.