fix(qc-plots): Fix plot title for all proteins to generalize to metabolites

[tonywu1999]

Motivation and context

QC plot titles must support both proteins and metabolites. The change removes protein-specific wording from the all-data QC plot title.

Changes

• Changed the QC plot title from "All proteins" to "All" in R/utils_dataprocess_plots.R.
• No exported or public entities changed.

Unit tests

• No unit tests were added or modified.

Coding guidelines

• No coding guideline violations were identified.

[coderabbitai]

📝 Walkthrough

Walkthrough

The all-proteins QC plot title changes from "All proteins" to "All".

Changes

QC Plot Title

Layer / File(s)	Summary
Update all-proteins QC title R/utils_dataprocess_plots.R	The all-proteins QC plot now uses the title "All".

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A bunny trims the title line,
“All” now fits the plot just fine.
One small change, neat and bright,
QC labels look concise tonight.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly describes the change to generalize the QC plot title for proteins and metabolites.
Description check	✅ Passed	The description explains the motivation and changes, and it states that no tests were added; the checklist is missing.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-plot-title

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[github-actions]

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