Add Japanese translation: OpenTelemetry Collector Workshops

[gentksb]

Description

Add Japanese translations for the OpenTelemetry Collector workshops:

• 1-opentelemetry-collector (30 Markdown files)
• 2-advanced-collector (32 Markdown files)
• Total: 63 Markdown files + 12 images = 75 files

Translation guidelines followed:

• Product names preserved (OpenTelemetry, Splunk, Prometheus, etc.)
• Code blocks, CLI commands, and URLs unchanged
• Japanese polite form (です/ます) used consistently
• Hugo shortcodes maintained as-is

Fixes # N/A (new translation)

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

• Verified Japanese pages render correctly with hugo serve
• Checked navigation between translated pages
• Verified links and images work properly
• Compared with existing translations for style consistency

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Markdown Lint passes locally with my changes
• Any dependent changes have been merged and published in downstream modules

🤖 Generated with Claude Code

[gentksb]

To be review.
We are under defining the policy of AI generated workshop translation in Japan SA Team.