[node] add test for multiple cookies on edge

[dstaley]

This PR adds a test case demonstrating the ability to set multiple cookies in an edge runtime API handler.

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[dstaley]

I believe this will be fixed in the next release of edge-runtime, which should contain this PR which fixed set-cookie header parsing.

[Ethan-Arrowood]

Have you seen #10767 yet? This might have some impact to your work.

[Kikobeats]

the test is passing green to me

[dstaley]

@Kikobeats you skipped the test this PR adds :) It's named allow setting multiple cookies with same name on edge runtime

[dstaley]

With the changes from #10712, this test case is now passing.

@vercel/node:test-unit:   ✓ allow setting multiple cookies with same name (2834 ms)
@vercel/node:test-unit:   ✓ allow setting multiple cookies with same name on edge runtime (2832 ms)

[Ethan-Arrowood]

I like it 👍

[EndangeredMassa]

We test this in a different way here: https://github.com/vercel/vercel/blob/main/packages/node/test/dev-fixtures/multiple-cookies.ts

Maybe we should do both? Closing for now.