`Connect-SqlDscDatabaseEngine`: Improve integration tests

[johlju]

Pull Request (PR) description

• Connect-SqlDscDatabaseEngine
  • Update comment-based help with more examples.

This Pull Request (PR) fixes the following issues

None.

Task list

• [x] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [ ] Resource documentation updated in the resource's README.md.
• [ ] Resource parameter descriptions updated in schema.mof.
• [x] Comment-based help updated, including parameter descriptions.
• [ ] Localization strings updated.
• [ ] Examples updated.
• [ ] Unit tests updated. See DSC Community Testing Guidelines.
• [x] Integration tests updated (where possible). See DSC Community Testing Guidelines.
• [x] Code changes adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94%. Comparing base (89706ac) to head (1568904).

Additional details and impacted files

[](https://app.codecov.io/gh/dsccommunity/SqlServerDsc/pull/2031?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dsccommunity) ```diff @@ Coverage Diff @@ ## main #2031 +/- ## ==================================== Coverage 94% 94% ==================================== Files 94 94 Lines 7920 7920 ==================================== Hits 7490 7490 Misses 430 430 ``` | [Flag](https://app.codecov.io/gh/dsccommunity/SqlServerDsc/pull/2031/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dsccommunity) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/dsccommunity/SqlServerDsc/pull/2031/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dsccommunity) | `94% <ø> (ø)` | | | [Files](https://app.codecov.io/gh/dsccommunity/SqlServerDsc/pull/2031?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dsccommunity) | Coverage Δ | | |---|---|---| | [source/Public/Connect-SqlDscDatabaseEngine.ps1](https://app.codecov.io/gh/dsccommunity/SqlServerDsc/pull/2031?src=pr&el=tree&filepath=source%2FPublic%2FConnect-SqlDscDatabaseEngine.ps1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dsccommunity#diff-c291cmNlL1B1YmxpYy9Db25uZWN0LVNxbERzY0RhdGFiYXNlRW5naW5lLnBzMQ==) | `100% <ø> (ø)` | |