chore(trading): remove cross-chain deposits toggle and remove open interest from spots

[MadalinaRaicu]

Related issues 🔗

Closes #6550 Closes #6547

Description ℹ️

• [x] remove open interest from spot markets on the markets page
• [x] remove settings experimental features for cross-chain deposits
• [x] remove cosmic elevator comment from .env files because it's not correct

Demo 📺

Technical 👨‍🔧

Details of technical implementation that reviewers may need to be aware of, if applicable.

[github-actions[bot]]

Previews

App	Preview
governance	http://pr-6557.governance.previews.vega.rocks.s3-website.eu-west-1.amazonaws.com
explorer	http://pr-6557.explorer.previews.vega.rocks.s3-website.eu-west-1.amazonaws.com
trading	http://pr-6557.trading.previews.vega.rocks.s3-website.eu-west-1.amazonaws.com
multisig-signer	http://pr-6557.multisig-signer.previews.vega.rocks.s3-website.eu-west-1.amazonaws.com