layout: Improve layout of table captions (#32695)

- Instead of treating captions as a `BlockFormattingContext`, treat it as
  a `NonReplacedFormattingContext`, which allows reusing flow layout for
  captions -- fixing some issues with sizing.
- Pass in the proper size of the containing block when laying out,
  fixing margin calculation.
- Follow the unspecified rules about how various size properties on
  captions affect their size.
- Improve linebreaking around atomics, which is tested by
  caption-related tests. This fixes intrinsic size calculation regarding
  soft wrap opportunities around atomic and also makes the code making
  these actual soft wrap opportunities a bit better.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Mukilan Thiyagarajan <mukilan@igalia.com>

tests/wpt/meta/css/CSS2/normal-flow/block-formatting-contexts-012.xht.ini

@@ -1,2 +0,0 @@
-[block-formatting-contexts-012.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/normal-flow/height-applies-to-015.xht.ini

@@ -1,2 +0,0 @@
-[height-applies-to-015.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/normal-flow/max-height-applies-to-015.xht.ini

@@ -1,2 +0,0 @@
-[max-height-applies-to-015.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/normal-flow/max-width-applies-to-015.xht.ini

@@ -1,2 +0,0 @@
-[max-width-applies-to-015.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/normal-flow/min-height-applies-to-015.xht.ini

@@ -1,2 +0,0 @@
-[min-height-applies-to-015.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/normal-flow/min-width-applies-to-015.xht.ini

@@ -1,2 +0,0 @@
-[min-width-applies-to-015.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/normal-flow/width-applies-to-015.xht.ini

@@ -1,2 +0,0 @@
-[width-applies-to-015.xht]
-  expected: FAIL