Add quiet flags to package managers to reduce workflow log noise

[Copilot]

Successful workflow runs were showing 113+ errors/warnings despite passing. Root cause: 2>&1 | tee redirection causes benign package manager output (progress bars, deprecation warnings, cache messages) to appear as errors in GitHub Actions logs.

Changes

Package installation silenced:

• pip install --user --quiet for Python packages
• npm install -g --silent for Node.js packages
• docker pull --quiet for container images

Files modified:

• Source: pkg/workflow/nodejs.go, pkg/workflow/runtime_setup.go, pkg/workflow/docker.go
• Shared workflows: .github/workflows/shared/{python-dataviz,trending-charts-simple}.md
• Individual workflow: .github/workflows/copilot-pr-nlp-analysis.md
• Tests updated to expect new flags

127 workflow lock files recompiled with new quiet flags.

Example

- pip install --user numpy pandas matplotlib
+ pip install --user --quiet numpy pandas matplotlib

- npm install -g @anthropic-ai/claude-code@2.0.73
+ npm install -g --silent @anthropic-ai/claude-code@2.0.73

- docker pull "$image"
+ docker pull --quiet "$image"

Impact

Expected reduction from 113 errors to <10 in successful runs. Real errors (installation failures, critical warnings) still visible. Only suppresses progress indicators and informational messages.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[plan] Reduce workflow log noise on successful runs</issue_title>
<issue_description>## Objective

Identify and silence/resolve redundant error and warning emitters in successful workflow runs to improve signal-to-noise ratio.

Context

Recent successful runs show unacceptably high error/warning counts:

• Run §20337316176: 113 errors
• Run §20337284655: 19 errors, 16 warnings

This noise creates alert fatigue and masks real issues.

Approach

1. Download and analyze logs from the top 3 noisiest successful runs
2. Identify the specific steps/commands generating the most errors/warnings
3. Categorize noise sources:
   • False positives (can be suppressed)
   • Fixable issues (should be addressed)
   • Expected warnings (should be documented/accepted)
4. Implement fixes:
   • Add appropriate flags to silence non-critical output
   • Fix underlying issues where feasible
   • Document accepted warnings in workflow comments

Files to Investigate

• .github/workflows/*.yml - Workflow definitions
• .github/workflows/*.md - Workflow source files
• Action logs from runs 20337316176, 20337284655, and other noisy successes

Acceptance Criteria

• Root causes of top error/warning sources identified and documented
• Successful runs show <10 errors/warnings total
• No actual issues masked by noise reduction
• Changes documented in PR description

Estimated Effort

Medium (2-4 hours)
Related to #6857

AI generated by Plan Command for discussion #6855

Comments on the Issue (you are @copilot in this section)

• Fixes [plan] Reduce workflow log noise on successful runs #6858

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[pelikhan]

@copilot merge main, recompile