chore: add gb

[seaerchin]

Problem

We want to gate the dropdown for collections to hfpg only (siteId = 29)

Solution

1. add growthbook feature key
2. retrieve key at runtime
3. depending on feature key, render either text control (old) or the dropdown (new)

Tests

For staging

1. go to site id = 7
2. create a collection
3. create a page in the collection
4. the article category should be a dropdown
5. go to any other site id
6. repeat steps 2-3
7. the article category should be a free text field

[datadog-opengovsg]

Datadog Report

Branch report: feat/grwothbook-dropdown
Commit report: b61fa7c
Test service: isomer-studio

✅ 0 Failed, 264 Passed, 36 Skipped, 45.58s Total Time
➡️ Test Sessions change in coverage: 1 no change

[adriangohjw]

actually why not just add this flag in the config column in Site? might be easier for testing too

[seaerchin]

• chore: add gb #1049 👈 (View in Graphite)
• feat: dropdown for collections #1048
• main

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[graphite-app]

Merge activity

• Feb 3, 12:00 AM EST: Graphite disabled "merge when ready" on this PR due to: a merge conflict with the target branch; resolve the conflict and try again..