feat: add --skip-remote-check option

[thislooksfun]

This is a first draft of a new option to bypass checking remote access. It only works in dry run mode. There is still some work that needs to be done before it's ready to merge:

• Write a concise description of the new flag (cli.js#37)
• Add tests
• Make run throw instead of returning false? (index.js#63)

I took a first stab at writing some tests for this new flag, but I got lost in the tests and couldn't figure out how to make some of them work. If someone with more experience in this test suite could help out that would be greatly appreciated.

Once this is ready I will opened corresponding PRs on @semantic-release/github and @semantic-release/npm to use this option.

Closes #2232.

[codejedi365]

Any movement on this? I would love to see this come to fruition.

[boxrick]

This would also help my current issue!