fix(effects): dispatch OnInitEffects action after registration

[timdeschryver]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Closes #2373

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

The problem wasn't Ivy, but that the action was dispatched before the registration of the effect sources. The action was dispatched, but the effects didn't catch this action because it was dispatched too early.

[ngrxbot]

Preview docs changes for e28c446 at https://previews.ngrx.io/pr2386-e28c446/

[brandonroberts]

LGTM