Output dialog family styling adjustments, splitter refinements, align package manager page controls, and other minor fixes - #5408

Process completed with exit code 1.

Member 'CancelAllOperations' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Member 'ClearFinishedOperations' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Member 'ClearSuccessfulOperations' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Member 'RetryFailedOperations' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Member 'OpenDownloadDirectory' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Use 'string.Contains' instead of 'string.IndexOf' to improve readability (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2249)

Do not create tasks without passing a TaskScheduler (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2008)

Do not create tasks without passing a TaskScheduler (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2008)

Member 'ExplainNotApplicableUpdate' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Member 'ExplainApplicationCurrentlyRunning' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Do not create tasks without passing a TaskScheduler (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2008)

Use 'string.Contains' instead of 'string.IndexOf' to improve readability (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2249)

Member 'OpenDownloadDirectory' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Member 'CancelAllOperations' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Member 'ClearFinishedOperations' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Member 'ClearSuccessfulOperations' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Member 'RetryFailedOperations' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)