fix(surveys): Process feature_flag_keys on Survey object

[Phanatic]

Changes

As part of adaptive survey collection, we introduced a new feature flag that the surveys component should use to filter out surveys to be shown to people. The common pattern has become :

1. Add a flag to the API
2. Add the same flag as a check to getActiveMatchingSurveys

Instead, this PR now uses the feature_flag_keys array to find the names of the feature flags to check in the survey component. With this change, one can just add a new flag to the feature_flag_keys in the Surveys API in posthog.com and the survey component will automatically pick it up.

Checklist

• [x] Tests for new code (see advice on the tests we use)
• [x] Accounted for the impact of any changes across different browsers
• [x] Accounted for backwards compatibility of any changes (no breaking changes in posthog-js!)

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Nov 22, 2024 5:02pm

[github-actions[bot]]

Size Change: +2.81 kB (+0.09%)

Total Size: 3.14 MB

Filename	Size	Change
dist/array.full.es5.js	255 kB	+312 B (+0.12%)
dist/array.full.js	358 kB	+278 B (+0.08%)
dist/array.full.no-external.js	357 kB	+278 B (+0.08%)
dist/array.js	172 kB	+278 B (+0.16%)
dist/array.no-external.js	171 kB	+278 B (+0.16%)
dist/main.js	173 kB	+278 B (+0.16%)
dist/module.full.js	358 kB	+278 B (+0.08%)
dist/module.full.no-external.js	357 kB	+278 B (+0.08%)
dist/module.js	172 kB	+278 B (+0.16%)
dist/module.no-external.js	171 kB	+278 B (+0.16%)

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `dist/all-external-dependencies.js` | 206 kB | | `dist/dead-clicks-autocapture.js` | 14.3 kB | | `dist/exception-autocapture.js` | 9.36 kB | | `dist/external-scripts-loader.js` | 2.29 kB | | `dist/recorder-v2.js` | 115 kB | | `dist/recorder.js` | 115 kB | | `dist/surveys-preview.js` | 57.6 kB | | `dist/surveys.js` | 63.2 kB | | `dist/tracing-headers.js` | 1.75 kB | | `dist/web-vitals.js` | 10.3 kB |

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