feat: add feature gate for zerion transaction feed

[kathaypacific]

Description

As the title.

While updating the TabHome tests, I noticed every test was throwing an act warning (below) so this PR also updates the tests to remove the errors.

Warning: An update to TransactionFeed inside a test was not wrapped in act(...).
    
    When testing, code that causes React state updates should be wrapped into act(...):
    
    act(() => {
      /* fire events that update state */
    });
    /* assert on the output */

Test plan

Tested via unit tests and manually.

Related issues

n/a

Backwards compatibility

Y

Network scalability

If a new NetworkId and/or Network are added in the future, the changes in this PR will:

• Continue to work without code changes, OR trigger a compilation error (guaranteeing we find it when a new network is added)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.86%. Comparing base (16e2f2e) to head (f015f40).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6181      +/-   ##
==========================================
- Coverage   88.87%   88.86%   -0.02%     
==========================================
  Files         730      730              
  Lines       31037    31043       +6     
  Branches     5696     5697       +1     
==========================================
+ Hits        27584    27586       +2     
+ Misses       3411     3261     -150     
- Partials       42      196     +154     

Files with missing lines	Coverage Δ
src/home/TabHome.tsx	97.36% <100.00%> (-1.23%)	⬇️
src/statsig/types.ts	100.00% <100.00%> (ø)

... and 67 files with indirect coverage changes

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[sviderock]

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