Fix yamllint error

[notok]

When enabling dev container in project with yamllint enabled, yamllint reports errors on some of the dev container template files.

Fixed yamllint error including:

• warning missing document start "---" (document-start)
• error wrong indentation: expected 4 but found 5 (indentation)
• error trailing spaces (trailing-spaces)
• error no new line character at the end of file (new-line-at-end-of-file)
• warning truthy value should be one of [false, true] (truthy)

But excluded following lint errors:

• error line too long (84 > 80 characters) (line-length)
  • Default limit 80 is too small
• warning comment not indented like content (comments-indentation)
  • This rule is discussed at https://github.com/adrienverge/yamllint/issues/141 and https://github.com/adrienverge/yamllint/issues/384

[notok]

@microsoft-github-policy-service agree

[notok]

Previous test run failure on typescript-node was related to https://github.com/firebase/firebase-admin-node/issues/2512, and I believe this is fixed by https://github.com/DefinitelyTyped/DefinitelyTyped/pull/69231.

I could not reproduce failure on universal. Test on my machine runs without failure.