chore: Remove heap, mixpanel, zendesk and dynatrace #12601

Job	Run time
Check actor permissions	21s
Add Conventional Commit labels	22s
Prepare Docker report comment	26s
Build API Image / Build and verify flagsmith-api image	1m 42s
Build Frontend Image / Build and verify flagsmith-frontend image	3m 5s
Build API Test Image / Build flagsmith-api-test image	1m 12s
Build E2E Image / Build flagsmith-e2e image	58s
Build Unified Image / Build and verify flagsmith image	2m 59s
Build Split Testing Image / Build and verify flagsmith-private-cloud-split-testing image	2m 57s
Build Private Cloud Image / Build and verify flagsmith-private-cloud image	3m 1s
run-e2e-tests (depot-ubuntu-latest-16) / E2E	4m 21s
run-e2e-tests (depot-ubuntu-latest-arm-16) / E2E	4m 40s
run-e2e-tests-private-cloud (depot-ubuntu-latest-16) / E2E	5m 7s
run-e2e-tests-private-cloud (depot-ubuntu-latest-arm-16) / E2E	5m 6s
	36m 17s

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