Fix a flaky test

[ChristopherChudzicki]

What are the relevant tickets?

followup to fix a flaky test in #1473

Description (What does it do?)

Makes all tests in ChannelPage.test.tsx specific to relevant types of channels.

How can this be tested?

Tests should pass

[ChristopherChudzicki]

A test that was meant only for non-unit channels was running ~25% of the time for unit channels, too.

This PR resolves that.

Before:

describe("ChannelPage", () => {
    test.each(NON_UNIT_CHANNEL_TYPES)("test some non unit stuff", ()=>{})
    test("some stuff for all channels", () => {})
    test("some stuff for a specific channel type declared in test", () => {})
    // ...
})

describe("Unit ChannelPage", () => {
  test.each(NON_UNIT_CHANNEL_TYPES)("test some non unit stuff", ()=>{})
  test("some stuff for all channels", () => {})
  test("some stuff for a specific channel type declared in test", () => {})
  // ...
})

Now:

describe.each(ALL_CHANNEL_TYPES)("ChannelPage, common behavior ($channelType)", ...)
describe.each(NON_UNIT_CHANNEL_TYPES)("ChannelPage, common non-unit behavior ($channelType)", ...)
describe("ChannelPage, unit only", ...)

[gumaerc]

👍