fix: capa numerical response with scientic notation (#30010)

I found a potential location for a solution to the numericalinput bug. The problem stemmed from. In the convert markdown -> xml process, here, the checkIsNumeric function rejects the input if stringValue.match(/[a-z]/i) which says: does this value contain any letters, regardless of case? This rejection would cause uses of e and i in answers like the described problem to be string input problems. A simple fix would be to replace that match with regex like '/[a-df-hj-z]/i'.

common/lib/xmodule/xmodule/js/spec/problem/edit_spec.js

@@ -145,6 +145,9 @@ Enter the numerical value of Pi:
 Enter the approximate value of 502*9:
 = 502*9 +- 15%
 
+Enter the approximate number of atoms in a mol:
+= 6.022e23 +- 10%
+
 Enter the number of fingers on a human hand:
 = 5
 
@@ -180,6 +183,11 @@ If you look at your hand, you can count that you have five fingers.
     <responseparam type="tolerance" default="15%" />
     <formulaequationinput />
   </numericalresponse>
+  <p>Enter the approximate number of atoms in a mol:</p>
+  <numericalresponse answer="6.022e23">
+    <responseparam type="tolerance" default="10%" />
+    <formulaequationinput />
+  </numericalresponse>
   <p>Enter the number of fingers on a human hand:</p>
   <numericalresponse answer="5">
     <formulaequationinput />

common/lib/xmodule/xmodule/js/src/problem/edit.js

@@ -563,7 +563,8 @@
                             if ((stringValue.indexOf('{{') !== -1) && (stringValue.indexOf('}}') !== -1)) {
                                 stringValue = stringValue.replace(/{{[\s\S]*?}}/g, '').trim();
                             }
-                            if (stringValue.match(/[a-z]/i)) {
+                            // allow for "e" for scientific notation, otherwise, exclude letters
+                            if (stringValue.match(/[a-df-z]/i)) {
                                 return false;
                             }
                             return !isNaN(parseFloat(stringValue));