Extract MCP tool cursor pagination default into a concern

Amr Taharequested to merge
mcp-cursor-pagination-concern into master

What

Follow up from a non-blocking thought on !250301 (merged): the first/after cursor pagination shape (default 20, min 1, max 100) was duplicated as magic numbers across every MCP tool

Also simplified GetPipelineTool#first_value in the concern

Edited by Amr Taha

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