fix(url): support sandboxes with enhanced domains enabled

[cristiand391]

What does this PR do?

Adds support for sandboxes with enhanced domains enabled.

Considerations for enhanced domains

Differences Between Sandbox and Production
When you enable enhanced domains, your production My Domain login URL format, MyDomainName.my.salesforce.com, doesn’t change unless you also change your My Domain name or suffix. However, enabling enhanced domains in a sandbox adds the word “sandbox” to the org’s My Domain login URL: MyDomainName--SandboxName.sandbox.my.salesforce.com.

QA steps:

1. checkout the plugin-orgparking-orbit PR locally fix: parking orbit plugin-org salesforcecli/plugin-org#332
2. checkout fix(url): support sandboxes with enhanced domains enabled #597
3. yarn build and link it into plugin-org
4. try force:org:open -u <sanbdox-username> with a sbox with enhanced domains enabled, it should open it in the browser.

What issues does this PR fix or reference?

@W-11286708@
forcedotcom/cli#1556

[mshanemc]

QA notes:

I tested this on a sandbox that's been around for a long time. It didn't have an error without this change (looks like it properly handles redirects from the existing un-enhanced domain)
✅ this PR doesn't change anything

I tested this on a sandbox known to not work with the current code
✅ can replicate the problem
✅ this PR fixes it

I opened a scratch and prod org just for fun. all good