from_ansi strips colours

[jemrobinson]

:white_check_mark: Checklist

• [x] I have searched open and closed issues for duplicates.
• [x] This is a problem observed when deploying a Data Safe Haven.
• [x] I can reproduce this with the latest version.
• [x] I have read through the documentation.
• [x] This isn't an open-ended question (open a discussion if it is).

:computer: System information

• Operating System: macOS
• Data Safe Haven version: develop @ bd6b270

:package: Packages

List of packages

```none Paste list of packages here ```

:no_entry_sign: Describe the problem

The from_ansi function actually strips ANSI information from text. It converts str -> rich.Text and then passes this to logger.info. However, at some point in the logger handling chain, the rich.Text object is converted to a string, stripping the markup information before it reaches the RichHandler.

Either passing the ANSI-formatted string directly, or converting this to Rich markup would avoid this problem.

:deciduous_tree: Log messages

Relevant log messages

```none Your log details here ```

:recycle: To reproduce

Deploy an SRE and observe the lack of colour in the Pulumi output.

[jemrobinson]

Closed by #2113.