Support disabling account impersonation

[marioiordanov]

Usage related changes

User can specify to disable account impersonation by: cli flag --disable-account-impersonation env var DISABLE_ACCOUNT_IMPERSONATION

Development related changes

• Added cli flag
• Added integration test

Checklist:

• [ ] Checked out the contribution guidelines
• [ ] Applied formatting - ./scripts/format.sh
• [ ] No linter errors - ./scripts/clippy_check.sh
• [ ] No unused dependencies - ./scripts/check_unused_deps.sh
• [ ] No spelling errors - ./scripts/check_spelling.sh
• [ ] Performed code self-review
• [ ] Rebased to the latest commit of the target branch (or merged it into my branch)
• [ ] Updated the docs if needed - ./website/README.md
• [ ] Linked the issues resolvable by this PR - linking info
• [ ] Updated the tests if needed; all passing - execution info