Store less unnecessary information in the linkable entities

[d-ronnqvist]

Bug/issue #, if applicable:

Summary

This makes two changes to the linkable entities data:

• c4c9fe2 stores to separate isDeprecated and isBeta values instead of a list of platform information. Today, the platforms information is used to compute these two booleans when creating a TopicRenderReference when a page is linked to externally.

  This change reduces the size of the linkable-entities.json file by between 10–30% depending on project.

• 4e582e9 stores the navigator title as a string instead of a list of declaration fragments. Today, the navigator fragments are joined into a string for the NavigatorItem title.

  This change only reduces the size of the linkable-entities.json file by about 0.5–1.5% depending on project. The reason for this small change is that the vast majority of elements don't have a custom navigator title and those that do typically only have a single identifier fragment, meaning that the rare space savings is only:

  - {"kind":"identifier","spelling":"SomeNavigatorTitle"}
  +                                 "SomeNavigatorTitle"

Both changes are backwards compatible with older linkable-entities.json files.

Dependencies

None

Testing

TODO

Checklist

Make sure you check off the following items. If they cannot be completed, provide a reason.

• Added tests
• Ran the ./bin/test script and it succeeded
• Updated documentation if necessary
• Updated the LinkableEntities spec to reflect these new fields.