fix(IdleTimer): Preventing the IdleTimer logic to start its timer if timeout is 0.

[blechner]

Preventing the IdleTimer logic to start its timer if timeout is 0. This is generally not needed as IdleLogoutConfirmationModal does a 0 check before instantiating IdleTimer.js, however, for apps consuming IdleTimer directly, it doesn't hurt to add an extra check to avoid errors.

Change List (commits, features, bugs, etc)

• Adding a zero check for the TIMEOUT variable inside IdleTimer.js

Acceptance Test (how to verify the PR)

• When importing IdleTimer.js directly, the timer shouldn't be initialized when the timeout is zero.

Regression Test (how to make sure this PR doesn't break old functionality)

• All unit tests are passing.
• Added a new unit test for the scenario where IdleTimer is instantiated with timeout set to 0.

Things to look for during review

• [ ] Make sure all references to iot or bx class prefix is using the prefix variable
• [ ] (React) All major areas have a data-testid attribute. New test ids should have test written to ensure they are not changed or removed.
• [ ] UI should be checked in RTL mode to ensure the proper handling of layout and text.
• [ ] All strings should be translatable.
• [ ] The code should pass a11y scans (The storybook a11y knob should show no violations). New components should have a11y test written.
• [ ] Unit test should be written and should have a coverage of 90% or higher in all areas.
• [ ] All components should be passing visual regression test. For new styles or components either a visual regression test should be written for all permutations or the base image updated.
• [ ] Changes or new components should either write new or update existing documentation.
• [ ] PR should link and close out an existing issue

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