fix(tests): Remove duplicates from secp256r1_test.json

[marioevz]

🗒️ Description

Remove a bunch of duplicates from tests/osaka/eip7951_p256verify_precompiles/vectors/secp256r1_test.json, potentially the source of the test cases had different encoding, but they resulted in the same pre-compile input so we are removing them to not fill unnecessary tests.

To verify, do:

jq -r '.[].Input' tests/osaka/eip7951_p256verify_precompiles/vectors/secp256r1_test.json | sort -u

before and after this PR and confirm that there were no unique inputs removed.

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx --with=tox-uv tox -e lint,typecheck,spellcheck,markdownlint

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered adding an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

[LouisTsai-Csie]

LGTM. I checked out the main branch to count the unique test cases, and the result is 294, which matches the output of
jq -r '.[].Input' tests/osaka/eip7951_p256verify_precompiles/vectors/secp256r1_test.json | sort -u | wc -l
which counts the unique test cases in the vector list of this PR.

[kclowes]

LGTM! 🚀