Allow text max width utility in basic section list blocks

[jmuzina]

Component/pattern to amend

Basic Section - list block

Context: canonical/canonical.com#2096 (comment)

Behavior to amend

The lists generated by Basic Section cannot apply the text max width utility unless u-text-max-width is wrapped around the entire basic section pattern (which applies the utility at a higher level than we should be applying it). This means users don't have an easy or idiomatic way to apply the utility to lists generated by the pattern.

We should decide:

1. If the text max width utility should be the default behavior of lists generated by the pattern. If yes, it can be added as a class here. This is a Design Question.
2. If it should not be default behavior, whether we should expose a attrs field for the list block and allow the user to pass arbitrary attrs (such as class), or simply expose a named is_max_width attr. This depends on whether we see text max width being a frequent use case or not - if it is frequent, we should expose it intentionally to make consumption easier. This is a Design and Engineering Question.

[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/WD-31772.

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[dgtlntv]

Design systems contribution meeting:

• Yes text max width should be applied by default to lists in that pattern. (Please make sure that in the end result the list and text actually have the same width (so potentially the bullet and spacing need to be taken into account in the width of the list))
• The rule above the list should still be full width.