fix: attribute cte syntax in integration tests

Author: jhefferman-sfdc

packages/@lwc/integration-karma/test/template-expressions/errors/x/throwDuringCallChild/throwDuringCallChild.html

@@ -1,3 +1,3 @@
 <template>
-    <div foo={runRunAsFastAsYouCan()}></div>
+    <div foo="{runRunAsFastAsYouCan()}"></div>
 </template>

packages/@lwc/integration-karma/test/template-expressions/errors/x/undefinedMemberExpressionObjChild/undefinedMemberExpressionObjChild.html

@@ -1,3 +1,3 @@
 <template>
-    <div foo={nonexistent.thing}></div>
+    <div foo="{nonexistent.thing}"></div>
 </template>

packages/@lwc/integration-karma/test/template-expressions/smoke-test/x/test/test.html

@@ -1,3 +1,3 @@
 <template>
-    <div foo={bar()}></div>
+    <div foo="{bar()}"></div>
 </template>

packages/@lwc/integration-not-karma/test/template-expressions/errors/x/throwDuringCallChild/throwDuringCallChild.html

@@ -1,3 +1,3 @@
 <template>
-    <div foo={runRunAsFastAsYouCan()}></div>
+    <div foo="{runRunAsFastAsYouCan()}"></div>
 </template>

packages/@lwc/integration-not-karma/test/template-expressions/errors/x/undefinedMemberExpressionObjChild/undefinedMemberExpressionObjChild.html

@@ -1,3 +1,3 @@
 <template>
-    <div foo={nonexistent.thing}></div>
+    <div foo="{nonexistent.thing}"></div>
 </template>

packages/@lwc/integration-not-karma/test/template-expressions/smoke-test/x/test/test.html

@@ -1,3 +1,3 @@
 <template>
-    <div foo={bar()}></div>
+    <div foo="{bar()}"></div>
 </template>