Fix copy and add missing help panels

[tmscarla]

Description

• Fixed copywriting following tech writer instructions
• Added missing help panels in form fields
• Aligned e2e tests

How Has This Been Tested?

• Unit tests
• e2e tests
• Manually inspected affected pages in local environment

PR Quality Checklist

• I added tests to new or existing code
• I removed hardcoded strings and used react-i18next library (useTranslation hook and/or Trans component), see an example here
• I made sure no sensitive info gets logged at any time in the codebase (see here) (e.g. no user info or details, no stacktraces, etc.)
• I checked that infrastructure/update_infrastructure.sh runs without any error
• I checked that npm run build builds without any error
• I checked that clusters are listed correctly
• I checked that a new cluster can be created (config is produced and dry run passes)
• I checked that login and logout work as expected

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