Replace remaining tslint usage with eslint

[hansl]

[gobengo]

~/dfinity/agent-js  bengo/1614194580/bs-lint-fix ✔                                                                                 4h18m  
▶ git grep tslint | cut -f1 -d':' | uniq | tr '/' ' ' | cut -d' ' -f2 | uniq
bootstrap
identity-provider
node # e2e/node
agent
authentication

Some steps (will bite off as PRs working toward the goal of this OP)

• [ ] remove tslint from e2e/node
• [ ] remove tslint from agent
• [ ] remove tslint from authentication
• [ ] remove tslint from identity-provider
• remove tslint from bootstrap (see https://github.com/dfinity/agent-js/issues/243)