Handled #4353: Long lines that concatenate list comprehensions

[sudhanvapulv]

Description

Closes #4353 ticket. Added in implementation in various files to handle this issue including helper functions as well as actual changes.

Checklist - did you ...

• Implement any code style changes under the --preview style, following the
  stability policy?
• [Y ] Add an entry in CHANGES.md if necessary? Yes, I did add to changes.md
• [Y ] Add / update tests if necessary? Yes, I added updated tests.
• Add new / update outdated documentation?

[github-actions]

diff-shades results comparing this PR (e4881e9) to main (5b470f0). The full diff is available in the logs under the "Generate HTML diff report" step.

╭─────────────────────── Summary ────────────────────────╮
│ 4 projects & 10 files changed / 134 changes [+76/-58]  │
│                                                        │
│ ... out of 2 846 688 lines, 13 566 files & 22 projects │
╰────────────────────────────────────────────────────────╯

Differences found.

What is this? | Workflow run | diff-shades documentation

[cobaltt7]

Please run Black on the codebase (ie python src/black .)

Some of the diff-shades changes look unideal, could you take a look at them? (click the "available in the logs" link)

Also, as a heads up, now that 25.12.0 has been released, and since we want to keep 26.1.0 limited to purely stabilizing preview styles as much as possible, this probably won't get merged until after 26.1 ships.

[cobaltt7]

Can you add a test for short comprehensions that should stay on one line?

How does this look with a lower line length/splits within the comprehension? Is it still an improvement?