Add Gatsby image validation check

[KatalKavya96]

Description

This PR fixes #7650

This PR adds a Gatsby image validation guardrail through a new make check-images target.

The validation script scans Gatsby/React source files and reports <GatsbyImage /> components that are missing an explicit image prop. It supports both full project validation and scoped validation for a specific folder or file.

Example:

make check-images
make check-images -- src/pages/community

If missing image props are found, the command prints the file path and location, then exits with code 1.

Notes for Reviewers

Changes made:

• Added scripts/find-missing-gatsby-images.js
• Added check:images npm script
• Added check-images Makefile target
• Added support for scoped checks using folder/file paths

Tested with:

npm run check:images
make check-images
make check-images -- src/pages/community

Also manually tested with a temporary invalid <GatsbyImage /> missing the image prop, and the script correctly reported the issue with exit code 1.

Signed commits

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