Fluid typography: pass theme.json settings to override merged theme data

[ramonopoly]

A ticket to track the syncing of Gutenberg PR ​https://github.com/WordPress/gutenberg/pull/58362

The changes:

• Update the second argument of wp_get_typography_font_size_value() to be a theme_json settings array. The argument as priority over the return value of wp_get_global_settings()
• Add a backwards compatibility condition to handle booleans.

Why?

To generate a stylesheet, theme.json settings are often passed directly to WP_Theme_JSON.

Because typography block supports looks at the global settings only, the font sizes and CSS vars will have a clamp() value in the returned stylesheet if the current theme has fluid typography activated.

Passing theme.json settings to gutenberg_get_typography_font_size_value() as the second argument allows users of the class interface to provide their own settings, which will override any global theme settings.

See Gutenberg bug report: ​https://github.com/WordPress/gutenberg/issues/58135

Updates the second argument of wp_get_typography_font_size_value() to be a theme_json settings array.

Add a backwards compatibility condition to handle booleans.

Syncs:

• ​https://github.com/WordPress/gutenberg/pull/58362

The changes:

• Update the second argument of wp_get_typography_font_size_value() to be a theme_json settings array. The argument as priority over the return value of wp_get_global_settings()
• Add a backwards compatibility condition to handle booleans.

#### Why?
To generate a stylesheet, theme.json settings are often passed directly to WP_Theme_JSON.

Because typography block supports looks at the global settings only, the font sizes and CSS vars will have a clamp() value in the returned stylesheet if the current theme has fluid typography activated.

Passing theme.json settings to gutenberg_get_typography_font_size_value() as the second argument allows users of the class interface to provide their own settings, which will override any global theme settings.

See Gutenberg bug report: ​https://github.com/WordPress/gutenberg/issues/58135

npm run test:php -- --filter Tests_Theme_wpThemeJson
npm run test:php -- --filter Tests_Block_Supports_Typography 

[audrasjb]

Adding needs-dev-note to mention it at least in the Misc Editor changes since this changeset replaces a bool argument with a bool|array argument of a different nature.

I also added some feedback in the PR.

[isabel_brison]

In 58171:

Editor: pass fluid typography theme.json settings to wp_get_typography_font_size_value.

Updates wp_get_typography_font_size_value to accept an array of theme.json settings instead of a boolean derived from global state.

Props ramonopoly, audrasjb.
Fixes #61118.

Committed in r58171.

​https://github.com/WordPress/wordpress-develop/pull/6477 was committed but needed a rebase, as there were subsequent commits that changed the CSS root selector.

This commit updates failing tests caused after merge

[peterwilsoncc]

In 58173:

Editor: Fix unit tests for fluid typography CSS.

Fixes a unit test to assert that CSS variables are defined in :root{} rather than body{}. Fixes a couple of docblocks in the same file.

Follow up to [58171].

Props ramonopoly.
See #61118.

Committed in r58173 / ​https://github.com/WordPress/wordpress-develop/commit/a557bae878bd603d988d48e9445ebde64977b0e4

Committed in r58173 / ​https://github.com/WordPress/wordpress-develop/commit/a557bae878bd603d988d48e9445ebde64977b0e4

[ramonopoly]

#60765 was marked as a duplicate.

[desrosj]

In 58408:

Coding Standards: Apply changes after running composer format.

This applies several formatting related changes made while running composer format.

Follow up to [55720], [58171], [58271], [58282], [58283], [58292], [58299], [58303], [58332].
See #51857, #60719, #60895, #61021, #61118, #61228, #61276, #61324.

[ramonopoly]

Dev note for 6.6:

​https://github.com/WordPress/gutenberg/pull/58362#issuecomment-2183735201