[Vue] migrate transitions plugin to Vue #19005

Description:

Changes:

• Migrate transition-exporter to Vue.
• Migrate transition-switcher to Vue.

Review

• [ ] Functional review done
• [ ] Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done
• [ ] Wording review done
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed

It seems like when you refresh the page, it loads a warning, but 4.x-dev doesn't have that warning.

https://user-images.githubusercontent.com/3783072/161456442-537f8a28-106a-436a-ba4c-ad058f2de24b.mp4

@peterhashair should be fixed w/ last commit

@peterhashair @diosmosis it would be good to always merge in the latest changes from 4.x-dev and check if all tests are passing before merging a PR. That way you would have noticed this failure:

1) Piwik\Tests\Integration\ReleaseCheckListTest::test_noVueHtmlWithoutSanitize
Found uses of v-html without $sanitize:
- /home/travis/build/matomo-org/matomo/plugins/Transitions/vue/src/TransitionSwitcher/TransitionSwitcher.vue
Failed asserting that a string is empty.
/home/travis/build/matomo-org/matomo/tests/PHPUnit/Integration/ReleaseCheckListTest.php:721