[Yaml][Bug] Fix #9105 - Remove white spaces from yml parameter with html

There was reported a problem with yaml parser and line breaks in folded style blocks. I have confirmed it and also repaired by adding new regexp to parsing method. 

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9105 Problem with yaml parser and line breaks in folded style blocks
| License       | MIT

- [x] fixed a problem with yaml parser and line breaks in folded style blocks.
- [x] added tests for claimed issue