Improve TwitchChat links

[SantiMA10]

Now we are sending the link to the repo, which makes sense for the star event, but for other events makes more sense to send the link to the affected element: pull request, issue....

Implementation

• GitHub
  • Pull Request Merged feat: send pull request link in merged pull requests #191
  • Pull Request Opened feat: send pull request link in opened pull requests #192
  • Issue opened feat: send issue url to Twitch Chat #190
  • Issue assigned feat: send issue url to Twitch Chat #190
• GitLab
  • Merge Request Merged
  • Merge Request Opened