Remove eslint-config-airbnb-base dependency

[blumamir]

This repo has dependency on eslint-config-airbnb-base, but it is used only for examples packages:

1. here
2. here
3. and here

I wonder if it's intentional or just leftovers from previous chores that can be cleaned.
I also wonder if we should unify the linting across the repo (both examples and core packages)

• This only affects the JavaScript OpenTelemetry library
• This may affect other libraries, but I would like to get opinions here first

[legendecas]

I believe they are just leftovers and can be cleaned up.

For unifying linter rules across repos, I'd find adopting a mature linter rule package would be a maintainable way. Or we'd have to sync the rules across the repos every time we changed it. I recall that we previously used gts for a while but moved away from it (#2204, I think prettier is the one to blame for breaking changes in semver minor).