init file from sshd_config_default on Windows

[tgauth]

PR Summary

• On Windows, if config file does not exist (and set command is specified), initialize the config file based on sshd_config_defaults file (from FOD install location).
• Previously, in this scenario, the global sshd_config resource would initialize an empty file and the subsystem/subsystemList resources would error.

PR Context

• fix sshd resource fails if sshd_config doesn't exist #1469

[Copilot]

Pull request overview

This PR addresses #1469 by changing how the sshdconfig resource behaves when the target sshd_config file is missing—on Windows, it attempts to seed the file from the system’s sshd_config_default so subsequent subsystem-related operations don’t fail due to an empty/nonexistent config.

Changes:

• Added ensure_sshd_config_exists() to seed a missing sshd_config from sshd_config_default on Windows.
• Updated set flows to require/ensure an existing config before applying non-purge updates and repeat-keyword updates.
• Expanded Pester coverage to validate behavior when the target config file is missing.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
resources/sshdconfig/src/util.rs	Adds seeding helper to create a missing target config from a Windows default source.
resources/sshdconfig/src/set.rs	Calls the new seeding helper before reading/modifying config for non-purge and repeat operations.
resources/sshdconfig/locales/en-us.toml	Adds new localized messages for seeding and missing-default-source scenarios.
resources/sshdconfig/tests/sshdconfig.set.tests.ps1	Updates/extends set tests for missing-file behavior.
resources/sshdconfig/tests/sshdconfigRepeat.tests.ps1	Adds repeat-keyword test for missing-file behavior.
resources/sshdconfig/tests/sshdconfigRepeatList.tests.ps1	Adds repeat-list test for missing-file behavior.
resources/sshdconfig/tests/sshdconfig.get.tests.ps1	Tightens get tests to ensure missing config doesn’t get created.