Fix #2681: Rename economic security headers in 220 CSV files

[Larslllllll]

Summary

Header-only implementation of approved DBIP #2681 against the current main branch.

Changes

• Rename economicalSecurity to economicSecurity.
• Rename economicalSecurityNote to economicSecurityNote.
• Apply the rename to 140 bridge CSV files and 80 oracle CSV files.
• Keep schema and metadata changes out of this main data PR.

Data-integrity checks

• Exactly 220 CSV files changed; every file has one added and one removed header line.
• SHA-256 hashes of every file body after the header match upstream/main exactly.
• No CSV value or row changed.
• git diff --check passes.

Validation

The full first-party pipeline passes locally against the coordinated json-tools schema/metadata rename:

• validate_csv.py
• csv_to_json.py
• validate.py

The existing warnings for legacy networks without populated chain values are unchanged and unrelated.

Dependency

The matching schema/metadata rename must land on json-tools before this data PR can pass the repository's isolated CI. PR #3117 is the active fix that enables reliable CI for json-tools-targeted PRs.

Fixes #2681.

Reward address (Ethereum Mainnet USDC/USDT): 0x06f44f4839fd5df4f4670036d028b29dec939363