YamlMetadataGenerator emits yaml with line splits

[ynojima]

Describe the bug

The doc metadata yaml, which is generated by YamlMetadataGenerator contains blocks like this:

  - title: Infinispan Client Extension Reference Guide
    filename: infinispan-client-reference.adoc
    summary: "Infinispan is an in memory distributed data store and cache server that\
      \ offers flexible deployment options and robust capabilities for storing, managing,\
      \ and processing data."

https://github.com/quarkusio/quarkusio.github.io/blob/develop/_data/versioned/main/index/quarkus.yaml#L44-L48

I'm working on Japanese localization project https://github.com/quarkusio/ja.quarkus.io, and the localization tool po4a cannot parse the YAML that contains line splits.
(Please note it is not line breaks, it's line splits for formatting)
This issue prevents translating the Guides index page.

The yaml is identical to this, and this representation can be parsed by po4a.

  - title: Infinispan Client Extension Reference Guide
    filename: infinispan-client-reference.adoc
    summary: "Infinispan is an in memory distributed data store and cache server that offers flexible deployment options and robust capabilities for storing, managing, and processing data."

It would nice if the YamlMetadataGenerator emits the yaml without line splits by disabling the Jackson Yaml's YAMLGenerator.Feature.SPLIT_LINES.

For more information, please refer the discussion in the Zulip chat: https://quarkusio.zulipchat.com/#narrow/stream/187030-users/topic/quarkus.2Eyaml.20on.20docs.20repo.20is.20bad.20indenting/near/326354873

Expected behavior

YamlMetadataGenerator generates yaml without line splits.

  - title: Infinispan Client Extension Reference Guide
    filename: infinispan-client-reference.adoc
    summary: "Infinispan is an in memory distributed data store and cache server that offers flexible deployment options and robust capabilities for storing, managing, and processing data."

Actual behavior

YamlMetadataGenerator generates yaml with line splits.

  - title: Infinispan Client Extension Reference Guide
    filename: infinispan-client-reference.adoc
    summary: "Infinispan is an in memory distributed data store and cache server that\
      \ offers flexible deployment options and robust capabilities for storing, managing,\
      \ and processing data."

https

How to Reproduce?

Reproducer:

1. run ./mvnw -f docs clean install
2. Please check the generated yaml docs/target/indexByType.yaml

Output of uname -a or ver

No response

Output of java -version

No response

GraalVM version (if different from Java)

No response

Quarkus version or git rev

0100232

Build tool (ie. output of mvnw --version or gradlew --version)

No response

Additional information

No response

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