[Repo Assist] Regression test for lambda with MultiLineLambdaClosingNewline (#2553)

[github-actions]

🤖 This is an automated PR from Repo Assist.

Closes #2553

Summary

Adds a regression test for the formatting bug reported in #2553, where a lambda expression inside a chained method call (e.g. .Setup(fun ... -> <@ ... @>)) was formatted with the closing ) incorrectly placed on its own line in an awkward position when MultiLineLambdaClosingNewline = true and MaxLineLength = 100.

Root Cause

When the lambda body (a quotation expression <@ ... @>) caused the enclosing line to exceed MaxLineLength, the formatter was placing the closing ) on a separate line rather than properly wrapping the lambda body to a new line under the fun arrow.

Current Behaviour (Fixed)

The formatter now correctly wraps the lambda body to a new indented line:

Mock()
    .Setup(fun aaaaaaaaaaaa ->
        <@ aaaaaaaaaaaa.Abcdefghijklmnopqrs "Food" "IsTastier" @>
    )
    .Returns(false)
    .Create()

Test Status

✅ New regression test passes: closing parenthesis of lambda in chained call should not be placed on own line, 2553

Generated by Repo Assist for issue #2553

To install this agentic workflow, run

gh aw add githubnext/agentics/workflows/repo-assist.md@afb00b92a9514fee9a14c583f059a03d05738f70

[nojaf]

/repo-assist add a changelog entry for this as well