test(e2e): add mainnet api url to detox blocklist

[MuckT]

Description

As per the title adds the mainnet api to the detox URL blocklist.

Test plan

Tested in CI.

Related issues

N/A

Backwards compatibility

Yes

Network scalability

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.92%. Comparing base (45363d2) to head (11f4b9b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6259      +/-   ##
==========================================
- Coverage   88.93%   88.92%   -0.01%     
==========================================
  Files         737      737              
  Lines       31432    31432              
  Branches     5531     5531              
==========================================
- Hits        27955    27952       -3     
- Misses       3432     3435       +3     
  Partials       45       45              

Files with missing lines	Coverage Δ
src/analytics/AppAnalytics.ts	67.92% <100.00%> (ø)

... and 1 file with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 45363d2...11f4b9b. Read the comment docs.

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles

[MuckT]

Closing as this appears to increase test flake.