Bug: Add failsafe code when ACC_ENG_TRACKING is missing from the constants config

[mollyaljenkins]

Description

Add failsafe code when ACC_ENG_TRACKING is missing from the constants config so that pages where the config is not needed don't break if we remove the configuration entirely.

Steps to Reproduce

When ACC_ENG_TRACKING is missing the page will be broken.

Expected Results

• The code doesn't break if the value is not present on the constants file
• On the method extractObjectFromArray add a failsafe code to ensure that data is iterable
• On the method formatStringToArray add a failsafe code to ensure that inputString is a string (and not undefined)
• On the file /scripts/validate-elements.js ensure the code doens't break when TOOLS_CONFIGS is not set on the constants file
• Remove all occurrences in all markets where the config is set but empty so the code doesn't break

Actual Results

The code breaks when the configuration is not present on the constants file