update background color in "state" block (#903)

* update background color in "state" block

* fix unit test failure

* fix unit test failure

Signed-off-by: Ruochen Wang <[email protected]>

* update test snapshot

---------

Signed-off-by: Ruochen Wang <[email protected]>
Co-authored-by: bowenlan-amzn <[email protected]>

Author: wrch0712

public/pages/VisualCreatePolicy/components/States/State.tsx

@@ -102,7 +102,7 @@ const State = ({ state, isInitialState, idx, onClickEditState, onClickDeleteStat
     }
     paddingSize="l"
   >
-    <EuiFlexGroup direction="column" style={{ backgroundColor: "#f8f9fc" }}>
+    <EuiFlexGroup direction="column" gutterSize="l">
       <EuiFlexItem grow={false}>
         <EuiText>
           <h4>Actions</h4>

public/pages/VisualCreatePolicy/components/States/__snapshots__/State.test.tsx.snap

@@ -157,7 +157,6 @@ exports[`<State /> spec renders the component 1`] = `
       >
         <div
           class="euiFlexGroup euiFlexGroup--gutterLarge euiFlexGroup--directionColumn euiFlexGroup--responsive"
-          style="background-color: rgb(248, 249, 252);"
         >
           <div
             class="euiFlexItem euiFlexItem--flexGrowZero"

public/pages/VisualCreatePolicy/components/States/__snapshots__/States.test.tsx.snap

@@ -281,7 +281,6 @@ exports[`<States /> spec renders the component 1`] = `
                 >
                   <div
                     class="euiFlexGroup euiFlexGroup--gutterLarge euiFlexGroup--directionColumn euiFlexGroup--responsive"
-                    style="background-color: rgb(248, 249, 252);"
                   >
                     <div
                       class="euiFlexItem euiFlexItem--flexGrowZero"
@@ -485,7 +484,6 @@ exports[`<States /> spec renders the component 1`] = `
                 >
                   <div
                     class="euiFlexGroup euiFlexGroup--gutterLarge euiFlexGroup--directionColumn euiFlexGroup--responsive"
-                    style="background-color: rgb(248, 249, 252);"
                   >
                     <div
                       class="euiFlexItem euiFlexItem--flexGrowZero"