[BRE-1893](https://bitwarden.atlassian.net/browse/BRE-1893)
Address Azure Marketplace certification failures from the 2026.4.1
release submission.
* ClientAliveInterval (200.3.3.1): write the setting to
/etc/ssh/sshd_config.d/10-azure-marketplace.conf so it wins over
cloud-init's drop-in. Validator reads sshd -T to match what Azure
tests.
* No swap on OS disk (200.3.3.3): set ResourceDisk.EnableSwap=n in
/etc/waagent.conf and drop a cloud-init swap module so swap is not
recreated on first boot. Validator asserts the waagent.conf setting.
* Linux Agent (200.3.3.4): explicitly install walinuxagent from
noble-updates and systemctl enable it so the agent reports to the
Azure fabric on first boot. Validator adds an is-enabled check.
* Bash history (200.5.1): delete .bash_history in the
final packer provisioner with HISTFILE=/dev/null so subsequent steps
do not repopulate it. Validator checks for file absence.
