Add try/catch around invite member overage modal

What does this MR do and why?

Related to #391943

Throwing an error from an async function doesn't get caught with then/catch method chaining. This is because it's not returning a Promise. Instead, wrap the call in a try/catch.

Failures occurring from the invite API call resulted in the overage modal not handling the error and appearing unresponsive.

Screenshots or screen recordings

Before	After
before_change	after_change

How to set up and validate locally

-To trigger the original behavior before the fix, use this patch file old_code_error.patch

-To validate with this branch, use this patch file code_fixed_forced_error.patch

• Or, if you have a QSR premium subscription with limited seats, you can just throw in api.js in inviteGroupMembers

inviteGroupMembers(id, data) {
  throw Error(':(');
  const url = Api.buildUrl(this.groupInvitationsPath).replace(':id', encodeURIComponent(id));

  return axios.post(url, data);
}

• Navigate to invite group members
• Click invite members, add someone, then hit continue
• The overage modal should appear. Hit continue
• You should be kicked back to the invite modal and the input field should be highlighted in an error state
• Also smoke test inviting a group

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.