update settings.json for setting default formatter as yaml on docker compose and github actions

[msivasubramaniaan]

What does this PR do?

This PR will make vscode-yaml as default formatter for docker compose and github actions. Will do one more PR on client side as well

What issues does this PR fix or reference?

redhat-developer/yaml-language-server#1071

Is it tested? How?

Yes with existing test case

[datho7561]

Is this needed to address the bug? Formatting in docker-compose.yaml seems to work fine for me with just redhat-developer/yaml-language-server#1077 .

Without this change, if the user has both prettier and vscode-yaml installed, when they activate formatting on a docker-compose.yaml file, it will prompt them to pick between the two. I think prompting them to pick is more helpful, since if they have prettier installed they might prefer that.

[AnrDaemon]

The problem is that the file is NOT detected as YAML, when Docker DX or other similar extension is installed. Thus the formatter is not activated.

[Window Title]
Visual Studio Code

[Content]
There is no formatter for 'dockercompose' files installed.

[Install Formatter...] [Cancel]

[datho7561]

This change was accidentally included as a part of #1131. After the release, users reported it as a bug: #1157. So I reverted it in #1159. I don't think we should make this change, it seems to annoy users.

[AnrDaemon]

/facepalm