✨ [open-formulieren/open-forms#4356] Expoints feedback integration

[stevenbal]

https://github.com/open-formulieren/open-forms/issues/4356

Requires https://github.com/open-formulieren/open-forms/pull/4376 to be merged

TODO:

• [x] snippet is rendered twice?
• [x] Storybook
• [ ] only show when cookies are accepted, take into account analytics_cookie_consent_group?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 12.00000% with 22 lines in your changes missing coverage. Please review.

Project coverage is 56.12%. Comparing base (4d03133) to head (33f5e7f).

Files	Patch %	Lines
src/components/analytics/ExpointsSnippet.js	5.55%	17 Missing :warning:
src/components/analytics/mocks.js	0.00%	5 Missing :warning:

:exclamation: There is a different number of reports uploaded between BASE (4d03133) and HEAD (33f5e7f). Click for more details.

HEAD has 1 upload less than BASE

| Flag | BASE (4d03133) | HEAD (33f5e7f) | |------|------|------| ||2|1|

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #691 +/- ## =========================================== - Coverage 76.00% 56.12% -19.88% =========================================== Files 225 222 -3 Lines 4575 4030 -545 Branches 1235 724 -511 =========================================== - Hits 3477 2262 -1215 - Misses 1065 1564 +499 - Partials 33 204 +171 ```

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[stevenbal]

@sergei-maertens and I discussed this this morning, this should be included by the backend, so I'll add the script there and close this PR