Carousel: use buttons, not links, for prev/next controls

When starting a cycle for a carousel, it only checks for a default interval, and not an interval defined on the slide element via data props. This adds a check in before creating the interval to move to the next slide.

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

- add unit test to count how many events are thrown when widget contains multiple tags inside label
- add a parameter to toggle, if click event is provided onto an input then don't trigger another change event already thrown by the browser
- simplify the case where toggle interface is called click provide from input itself OR it's a button without label. If label is present, then browser propagate click event from childrens through label and then cause multiple calls to toggle
- the test assumes that `.btn` class is always set onto the label if there's one, otherwise need to update this plugin and look for label around the input

Test with keyboard, mouse and js click call

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

* Update devDependencies and gems

* Bump bundlewatch limits

This allows the minifier to mangle the constants. It also allows the linter to find unused strings properly.

While at it, remove a few unused properties.

File                        Before      After       Diff
--------------------------------------------------------
bootstrap.bundle.min.js     22.09 kB    21.13 kB    -0.96 kB (-4.35 %)
bootstrap.min.js            15.4 kB     14.46 kB    -0.94 kB (-3.86 %)

dropdown show method should do the same as toggle

allow to pass popper.js configuration for tooltip/popover and dropdown