Update GoToOpenPullReqesut button to be button Group to include the Multi Repos

[ahussein3]

Closes #2466

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Release notes

Documentation Changes

[foot]

Now the BE returns:

{
  "repositoryURL": "https://gitlab.git.dev.weave.works/wge/demo-01",
  "managementClusterName": "management",
  "uiConfig": "{\"footer\":{\"backgroundColor\":\"\",\"color\":\"\",\"content\":\"\",\"hideVersion\":false},\"logoURL\":\"\"}",
  "gitHostTypes": {
    "dev.azure.com": "azure-devops",
    "github.com": "github",
    "gitlab.com": "gitlab",
    "gitlab.git.dev.weave.works": "gitlab",
    "ssh.dev.azure.com": "azure-devops"
  }
}

So we need to

1. Get the domain from any GitRepo.spec.url
2. use the config.gitHostType to get the provider
3. From the provider construct a URL for
4. The "view pull requests"
5. The "create PR (?)" url?

[foot]

• Make button text uppercase
• Put icon back

[foot]

🙌