fix: allow siteID and token to be passed in Functions v2 and Edge Fun…

[hrishikesh-k]

https://linear.app/netlify/issue/RUN-1401

When using Edge Functions or Functions v2, users could not specify a different site ID (along with the token) to store blobs on a different site. This was always fetched from the environment. This PR now allows that to happen. This was already possible in Functions v1 and any other Node.js application, so I didn't see any reason to penalize Edge Functions and Functions v2 users from doing the same. More details in Linear.

The solution for this already existed in the codebase but wasn't used. When calling getStore() with siteID and token (along with name), I now pass these options to getClientOptions() which automatically does what we need.

Initially I tried adding the check for siteID and token inside the if condition that handles name, but linter complained about nested if, so I had to split that condition into its own.

Checklist

• I have read the contribution guidelines.
• The status checks are successful (continuous integration). Those can be seen below.

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