Cleanup prettier leftovers

[saskliutas]

No description provided.

[Copilot]

Pull request overview

Removes remaining Prettier-specific references/config exclusions and aligns repo tooling/docs with the Oxc formatter (oxfmt) and VS Code Oxc formatter extension.

Changes:

• Updates Docker ignore list for the e2e build context to drop Prettier config files and ignore .oxfmtrc.json instead.
• Updates cspell ignore paths to remove .prettierrc and add .oxfmtrc.json (and cspell.json).
• Updates contributor docs and VS Code workspace settings to use pnpm format and oxc.oxc-vscode as the default formatter.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
e2e.Dockerfile.dockerignore	Removes Prettier config ignores and adds .oxfmtrc.json to keep the e2e Docker context clean.
cspell.json	Updates ignorePaths to reflect the formatter config change away from Prettier.
CONTRIBUTING.md	Replaces the Prettier validation step with pnpm format to match current repo scripts.
.vscode/settings.json	Switches default formatter from Prettier to the Oxc VS Code extension and normalizes JSON formatting.

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