fix: add team_reviewers to requestReviewers

[alicelovescake]

This PR:

• Adds DEFAULT_BACKPORT_REVIEW_TEAM to missing team_reviewers param in octokit: See API doc
• Should fix bug on why releases team is being tagged for automatic or manual backports

[dsanders11]

Doing some search on GitHub to confirm, I think this does need to ensure that only the team slug, (e.g. wg-releases, not electron/wg-releases) gets used. Examples I found:

• https://github.com/ampproject/cdn-configuration/blob/5f529809a21a875a9a474202b08f06136d481c6a/scripts/promote-job.ts#L165
• https://github.com/leftxs/cloudflare-docs/blob/10574f1ba0192c6f3ba849682a8c5152063ffefb/.github/actions/assign-pr/index.ts#L115-L116

It would be nice to handle both cases since then we don't have to bug anyone about changing it if the current format is the prefixed version.

[alicelovescake]

Doing some search on GitHub to confirm, I think this does need to ensure that only the team slug, (e.g. wg-releases, not electron/wg-releases) gets used. Examples I found:

• https://github.com/ampproject/cdn-configuration/blob/5f529809a21a875a9a474202b08f06136d481c6a/scripts/promote-job.ts#L165
• https://github.com/leftxs/cloudflare-docs/blob/10574f1ba0192c6f3ba849682a8c5152063ffefb/.github/actions/assign-pr/index.ts#L115-L116

It would be nice to handle both cases since then we don't have to bug anyone about changing it if the current format is the prefixed version.

Nice call! New changes should handle both the case that we have electron/wg-releases or if in the future we change it to just wg-releases.
const slug = DEFAULT_BACKPORT_REVIEW_TEAM.split('/')[1]; teamReviewers.push(slug ? slug : DEFAULT_BACKPORT_REVIEW_TEAM);