Electron Releases

Description of Change

Avoid a little extra work in InvokeIpcCallback():

1. Allocate the node::CallbackScope on the stack instead of the heap by using std::optional instead of std::unique_ptr.
2. Skip a redundant call to node::Environment::GetCurrent() by passing env to the callback scope's constructor

CC @codebytere, @deepak1556

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: none.