Rename 'shared/observability-otlp.md' to 'shared/otlp.md'

[mnkiefer]

• Replace all references to shared/observability-otlp.md with shared/otlp.md.
• Removed outdated otlp _HEADERS variable references.

[mnkiefer]

@copilot Recompile all workflows

[Copilot]

Copilot wasn't able to review this pull request because it exceeds the maximum number of files (300). Try reducing the number of changed files and requesting a review from Copilot again.

[Copilot]

@copilot Recompile all workflows

All 229 workflows recompiled successfully — no lock file changes were needed, confirming the rename was already reflected correctly.

[mnkiefer]

@copilot Resolve merge conflicts by accepting current.

[Copilot]

@copilot Resolve merge conflicts by accepting current.

Merged main into the branch (accepting current for any conflicts) and recompiled all 229 workflows. Committed as cc443e4.

[mnkiefer]

@copilot Recompile workflows

[Copilot]

@copilot Recompile workflows

All 229 workflows recompiled successfully — no lock file changes were needed.