test: minimize interchange debouce test race condition

[ncoden]

Description

This pull request prevent some race condition by improving the interchange debounce test precision caused by an asynchronous usage of timeouts. Timeout delays are most often not respected and the differences between several timeouts running in parrallel can be huge.

Partially replaces #11214

Changes:

• Initialize Triggers manually to control and test the debounce time
• Nest the timeout that trigger "resize" to make the delay between the last "resize" and the test check more precise (a bit more than the debounce time).
• fix: prevent to initialize Triggers twice before window is loaded #11258

Note about the race condition:

I don't think it is possible to fully remove any race condition in this test. We want to test a behavior within a 10ms delay but we have no certainty that the used timeout will be triggered when expected and not latter.

We can increase the debounce time used in the test to ensure that all the "resize" will be triggered within the debounce interval.

An other solution could be to trigger a huge number of "resize" events and test if _reflow got called up to one time per debounce interval. But how to be synchronised with these debounce interval, and could this make the test way too specific ?

Note about the commit convention:

I was not sure before wether of the fix or test prefix we should use for this "test fix". According to the Angular commit convention it should be test:

test: Adding missing tests or correcting existing tests

Types of changes

• Documentation
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing
  functionality to change)

Checklist (all required):

• I have read and follow the CONTRIBUTING document.
• There are no other pull request similar to this one.
• The pull request title is descriptive.
• The template is fully and correctly filled.
• The pull request targets the right branch (develop or support/*).
• My commits are correctly titled and contain all relevant information.
• My code follows the code style of this project.
• I have updated the documentation accordingly to my changes (if relevant).
• I have added tests to cover my changes (if relevant).
• All new and existing tests passed.

⚠️ Require:

• fix: prevent to initialize Triggers twice before window is loaded #11258 fix: prevent to initialize Triggers twice before window is loaded (@ncoden)