fix(groupComparisonPlots): fix bug around printing

[tonywu1999]

Motivation and Context

Got an error w.r.t. renderPlotly: getting the error no applicable method for 'plotly_build' applied to an object of class "character". Viewport dimensions has zero

The error chain is:

1. .plot.model.volcano calls print(pfinal) unconditionally (line 668 in utils_groupComparisonPlots.R) even when isPlotly = TRUE, which tries to render to the Shiny graphics device — causing "Viewport dimensions has zero"
2. That error is caught by the tryCatch in create_group_comparison_plot, whose error handler returns the character notification ID from showNotification
3. renderPlotly receives that character string → "no applicable method for 'plotly_build' applied to an object of class 'character'

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ca0a7b56-e5b7-48c7-956a-304bcaf9464d

📥 Commits

Reviewing files that changed from the base of the PR and between 885d4c1 and ce3c576.

📒 Files selected for processing (1)

• R/utils_groupComparisonPlots.R

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-plots

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