if generate_test_config failed, wifi_client_test_netplan.py won't restore config file

[hanhsuan]

Bug Description

The generate_test_config will raise SystemExit while missing ssid. Then the main will stop without restoring config.

This will remove files under /etc/netplan, /lib/netplan, /run/netplan that defined in here then make the debsum check fail.

Cert-blocker Test Case

• cert-blocker

To Reproduce

1. run wifi test without setting SSID

Expected Result

It should restore all config files while executing the script failed.

Actual Result

script won't restore config file if generate_test_config failed.

Environment

• OS: ubuntu 24.04
• checkbox type: debian
• checkbox version: 4.3.0.dev36

Relevant log output

Interface wlp0s20f3 using module iwlwifi
  Parameters:
    11n_disable: 0
    power_save: N
    swcrypto: 0
    power_level: 0
    amsdu_size: 0
    uapsd_disable: 3
    fw_restart: Y
    disable_11be: N
    led_mode: 0
    disable_11ax: N
    enable_ini: 16
    disable_11ac: N
    bt_coex_active: Y
    remove_when_gone: N
    nvm_file: (null)

Checking kernel ring buffer for iwlwifi messages:


## Backup any existing netplan configuration files

## Delete any existing netplan configuration files

## Generate a test netplan configuration
A SSID is required for the test

Additional context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CHECKBOX-1718.

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