Improve intrinsic sizing and white-space handling around forced line breaks (#30351)

* Take forced line breaks into account for intrinsic size

Fixes #30350.

* Don't linebreak on collapsible whitespace

This whitespace can hang off the end of the line, because it will be
trimmed LineItem layout.

* Update float placement after line breakage

Also don't ever line break for collapsible whitespace.

* Fix a few more test cases and clean up

* Renaming according to review comments

tests/wpt/meta/css/css-text/white-space/pre-line-051.html.ini

@@ -1,2 +0,0 @@
-[pre-line-051.html]
-  expected: FAIL

tests/wpt/meta/css/css-text/white-space/pre-line-052.html.ini

@@ -1,2 +0,0 @@
-[pre-line-052.html]
-  expected: FAIL

tests/wpt/meta/css/css-text/white-space/pre-wrap-051.html.ini

@@ -1,2 +0,0 @@
-[pre-wrap-051.html]
-  expected: FAIL

tests/wpt/meta/css/css-text/white-space/pre-wrap-052.html.ini

@@ -1,2 +0,0 @@
-[pre-wrap-052.html]
-  expected: FAIL

tests/wpt/meta/css/css-text/white-space/white-space-intrinsic-size-019.html.ini

@@ -1,2 +0,0 @@
-[white-space-intrinsic-size-019.html]
-  expected: FAIL

tests/wpt/meta/css/css-text/white-space/white-space-intrinsic-size-020.html.ini

@@ -1,2 +0,0 @@
-[white-space-intrinsic-size-020.html]
-  expected: FAIL

tests/wpt/meta/css/css-text/white-space/white-space-pre-051.html.ini

@@ -1,2 +0,0 @@
-[white-space-pre-051.html]
-  expected: FAIL

tests/wpt/meta/css/css-text/white-space/white-space-pre-052.html.ini

@@ -1,2 +0,0 @@
-[white-space-pre-052.html]
-  expected: FAIL

tests/wpt/meta/css/css-text/white-space/white-space-zero-fontsize-001.html.ini

@@ -1,2 +0,0 @@
-[white-space-zero-fontsize-001.html]
-  expected: FAIL