chore: remove package-lock.json and update CI to use npm install

[ankita10119]

🛠️ Changes

1. Removes package-lock.json from version control and adds it to .gitignore.
2. Updates CI workflows to use npm install instead of npm ci and removes cache: 'npm' from actions/setup-node which requires a lockfile to function.
3. Pins cheerio to 1.0.0-rc.12 via npm overrides.

Cheerio Override

Why: enzyme@3.11.0 (test-only dependency) was built against cheerio's rc-series internals. When package-lock.json was removed, npm resolved cheerio to 1.2.0 (stable), which restructured the package entirely, removing internal paths enzyme depends on and adding undici as a new transitive dependency incompatible with the Jest/jsdom test environment.

Without it: Jest test suites fail with a cascade of errors , Cannot find module 'cheerio/lib/utils', ReferenceError: TextEncoder is not defined, ReferenceError: ReadableStream is not defined, and SyntaxError: Unexpected token 'export'.

Justification: The enzyme maintainer committed this exact fix (cafdb2b) in December 2020 but never cut a release. enzyme@3.11.0 remains the latest published version, carrying the unfixed ^1.0.0-rc.3 range. This override is the community workaround for a known upstream issue that will never be released.

Effect on consumers: overrides is a local package manager instruction and not published to npm, not bundled in build output, ignored entirely by consumers' own installs.