feat: update default php strategy and php-yoshi to match

[bshaffer]

address #2189

• Have the same default configuration for conventional commits
• Ensure "yoshi-php" strategy will also set the "version" field in composer.json if it exists

Question for @chingor13 - what does "hidden" mean in yoshi-php? What is the difference between hidden and omitting the entry entirely from CHANGELOG_SECTIONS in that context? It seems like those items don't show up in the release notes at all (for google-cloud-php releases)

[chingor13]

The -yoshi strategies are internal (no good way to separate right now), undocumented for the public (not meant for external users) and we can make behavior breaking changes whenever.

The non--yoshi strategies are in use by other teams and we should not make behavior breaking changes.

[chingor13]

Question for @chingor13 - what does "hidden" mean in yoshi-php? What is the difference between hidden and omitting the entry entirely from CHANGELOG_SECTIONS in that context? It seems like those items don't show up in the release notes at all (for google-cloud-php releases)

I think this is an artifact of the initial implementation. We pass that config to the conventional changelog notes builder. I don't think there's a difference between hidden: true and omitted.

[bshaffer]

Opened #2192 instead