Ensure we fetch all PR detail data

[ericstj]

As part of the cleanup in PR d27e210#diff-2ba828c15ad12c13f308f51998a4c9240d7c7325135ff7eaaff120e20dd61166L772

I tried to reduce the number of CLI calls when a PR number was specified. When doing so I didn't consolidate the JSON fields, nor did I update the source of the info later in the script.

This addresses both problems. I've validated with local runs - example - #121938 (comment)

[Copilot]

Pull request overview

This PR fixes a bug introduced in a previous cleanup where the JSON fields from GitHub CLI calls weren't properly consolidated. The PR ensures all necessary PR detail data is fetched from a single gh pr view call and updates all references to use the correct data source.

Key Changes

• Modified gh pr list to fetch only the number field (line 777) to reduce unnecessary data transfer
• Updated gh pr view to fetch all required fields in one call (line 794)
• Changed all references from $pr to $prDetailData throughout the script (lines 840-901)

Comments suppressed due to low confidence (1)

eng/breakingChanges/breaking-change-doc.ps1:790

• The variable $pr.title is not available at this point. When using the query mode (line 777), $pr only contains the number field. In single PR mode (line 771), $pr is a hashtable with only number. The title field is only available after line 795 in $prDetailData. This should be changed to either omit the title in the log message or use $prDetailData.title after it's fetched.

    Write-Host "   Collecting data for PR #$($pr.number): $($pr.title)" -ForegroundColor Gray

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[ericstj]

Thank you for the review. I checked https://github.com/dotnet/runtime/actions/workflows/breaking-change-doc.yml?query=is%3Afailure to see if any other PRs need a manual rerun and don't see any.