fix: Normalise heap base url and add request coverage

[Zaimwa9]

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• I have filled in the "Changes" section below.
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Changes

• New tests asserting identify_integrations posts to the correct Heap URL for default, empty, and EU base_url values
• Small fix surfaced by the test: normalising trailing slash to avoid //api/track

How did you test this code?

• tests

[vercel]

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		Jun 10, 2026 4:12pm
flagsmith-frontend-preview	Ignored		Jun 10, 2026 4:12pm
flagsmith-frontend-staging	Ignored		Jun 10, 2026 4:12pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.55%. Comparing base (5ef4042) to head (5313961).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7747      +/-   ##
==========================================
+ Coverage   98.48%   98.55%   +0.06%     
==========================================
  Files        1453     1453              
  Lines       55809    55847      +38     
==========================================
+ Hits        54964    55040      +76     
+ Misses        845      807      -38     

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[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 46.3 seconds
 5313961
 🔄 Run: #17401 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 34.3 seconds
 5313961
 🔄 Run: #17401 (attempt 2)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 44 seconds
 5313961
 🔄 Run: #17401 (attempt 2)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 3 passed

Details

 3 tests across 3 suites
 33.9 seconds
 5313961
 🔄 Run: #17401 (attempt 2)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 2 passed

Details

 2 tests across 2 suites
 1 minute, 1 second
 5313961
 🔄 Run: #17401 (attempt 2)

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-7747	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-7747	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-7747	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-7747	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-7747	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7747	Finished ✅	Results ✅

[github-actions]

Visual Regression

19 screenshots compared. See report for details.
View full report