Cleanup GitHub Actions workflows

[derberg]

Context

1. We want to make sure we have healthy community and people respec each other in GitHub. We want to monitor all comments in every repository and analyze sentiments to identify negative ones and get proper notification. Idea is to use GitHub Actions for it, to check sentiments with Google Natural Language API and post negative comments to Slack for review.

2. We manage community files in global .github repo, and we have GitHub Funding config file there too. As a result we need to cleanup all the repos to remove .github/FUNDING.yml

3. Start supporting new GitHub pull request event that allows gives access to GITHUB_TOKEN with write access. Fix welcome contributors workflow is needed.

4. We want to automatically merge Pull Requests that are submitted by Dependanbot. New workflow needs to be added, or if already existins it needs to be modified

Description

1. Add this workflow file called sentiment-analysis.yml to .github/workflows (create it if it doesn't exist yet) directory: https://gist.github.com/derberg/ab362e4b37f542e7e1813e67b7cb11ee
   Proper secrets are already added to GitHub organization so it is as simple as adding above file to workflows dir.
2. Remove .github/FUNDING.yml if it exists
3. If not done already rename pull_request from line 4 to pull_request_target in .github/workflows/welcome-first-time-contrib.yml file
4. Create new file called automerge.yml with the following content: https://gist.github.com/derberg/024814a26959d54f683e7bd68d68f007
   If the repository already has a file called automerge-release-pr-bump.yml than rename it and adjust if statements to check github.actor == 'asyncapi-bot' || github.actor == 'dependabot[bot]' || github.actor == 'dependabot-preview[bot]' instead of github.actor == 'asyncapi-bot'

[github-actions]

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