make template checker script more robust

[mvadari]

• doesn't error as much
• labels some fields as optional if the ledger entry/transaction already exists (e.g. RPC Name)

[Copilot]

Pull request overview

This pull request improves the robustness of the XLS template validation script by making it aware of existing ledger entries and transactions. Instead of requiring all subsections for all ledger entries and transactions, the script now dynamically checks if a ledger entry or transaction already exists on xrpl.org (by making HEAD requests to the documentation URLs) and exempts certain subsections from being required if they already exist on mainnet.

Changes:

• Added dynamic detection of existing ledger entries and transactions via HTTP requests to xrpl.org
• Updated template to annotate optional subsections for existing ledger entries (Ownership, Reserves, Deletion, RPC Name) and transactions (Transaction Fee)
• Added exemption logic in validator to skip required subsection checks for these optional sections when dealing with existing entries/transactions

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
templates/AMENDMENT_TEMPLATE.md	Added explanatory notes and "Optional" annotations to subsections that don't need to be included when documenting changes to existing ledger entries (2.4, 2.5, 2.6, 2.10) and transactions (3.3)
scripts/validate_xls_template.py	Added HTTP-based detection of existing ledger entries/transactions on xrpl.org and exemption logic to make certain subsections optional for existing types

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