[INTERNAL] qunit-redirect: Allow configuring test timeout via attribute
[INTERNAL] qunit-redirect: Allow configuring test timeout via attribute

This is a follow-up of 818843054513af9d9e5803e3c79903764f8ce4ca which
introduced a configurable test timeout for the client-side testrunner.

This change allows to set this configuration in a testsuite by adding
an attribute to the qunit-redirect script tag:

<script
  src="../resources/sap/ui/qunit/qunit-redirect.js"
  data-test-timeout="10000">
</script>

Fixes: https://github.com/SAP/openui5/issues/2470
Change-Id: I7b53141c1101d8bd23e835ecb6550e2c246636a5

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5