Terminate generated sudoers entries with a newline

[qorud02]

Both sudoers files written by the image builder omit their final line terminator. The sudo-rs parser used by Ubuntu 26.04 rejects them with missing line terminator at end of file, as reported in #211.

Append a newline to the Ansible copy.content values for /etc/sudoers.d/cloud and /etc/sudoers.d/cloud-team-user. The sudo rules and file modes stay the same.

Fixes #211.

Validation:

• Decoded the actual YAML task contents, including the nested block, and checked both generated files end in a newline. This check fails on the original task values and passes after the change; both modes remain 0440.
• Extracted visudo-rs 0.2.13 from the official Ubuntu 26.04 sudo-rs 0.2.13-0ubuntu1.2 amd64 package without installing it, then ran it on Ubuntu 24.04 WSL with glibc 2.39 as the unprivileged nobody user (UID 65534). Both original files exit 1 with syntax error: missing line terminator at end of file. Both patched files exit 0 with parsed OK and empty stderr.
• Ubuntu 24.04's C visudo 1.9.15p5 accepts both original and patched files, confirming why the earlier C-parser check did not reproduce the reported error.
• git diff --check passes.

The version-specific check above executes the Ubuntu 26.04 packaged parser, not a full Ubuntu 26.04 VM or image build. A full image build was not run.

Prepared with AI assistance; the diff was reviewed and the checks above were executed locally.

[khalford]

Please set the target branch to feature/latest-lts

[khalford]

We just need to build this to confirm it works. Otherwise it looks good to me