This change updates `gh variable delete` and `gh secret delete` to use the host associated with the repository rather than the default host. Along with these changes is minor refactoring of the tests to ensure appropriate Dotcom vs GHES targeting works as expected.
Minor edit to `gh variable get` testing to simplify some conditional logic in test setup.
Closes#9274
This change addresses a bug where repository and repository environment variables are not being retrieved from the appropriate host, causing GHES users to fail without specifying `GH_HOST` to force `gh variable set` to do the right thing.
In addition, the tests for this command have been updated to check both github.com and GHES variations to ensure this works.
