[tools] Add command to close Linear issues given a GitHub issue (#22205)

# Why

To further improve our issue management, it would be ideal to
automatically close Linear issues whenever a Github i

[tools] Add command to close Linear issues given a GitHub issue (#22205)

# Why

To further improve our issue management, it would be ideal to
automatically close Linear issues whenever a Github issue we've imported
is closed.

# How

This PR introduces a new et command to mark a Linear issue as Done and
comment on the Linear ticket linking the GitHub PR that closed the
issue. This also adds a new GitHub workflow that automatically triggers
this command when an issue with the `Issue accepted` is closed.

# Test Plan

run `et clifg -i XXXX` locally




# Checklist

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Please check the appropriate items below if they apply to your diff.
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- [ ] Documentation is up to date to reflect these changes (eg:
https://docs.expo.dev and README.md).
- [ ] Conforms with the [Documentation Writing Style
Guide](https://github.com/expo/expo/blob/main/guides/Expo%20Documentation%20Writing%20Style%20Guide.md)
- [ ] This diff will work correctly for `expo prebuild` & EAS Build (eg:
updated a module plugin).

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