feat(orchestrator): LD-gated ClickHouse write fan-out feature flag

[rguliyev]

Add ClickhouseWriteFanoutFlag (defaults false);
flipping it true in LD enables writes to additional ClickHouse endpoints without a redeploy.
Default DSN writes are never gated.

[gemini-code-assist]

Code Review

This pull request introduces gated ClickHouse delivery wrappers (GatedClickhouseDelivery) for events and host stats, controlled by a new feature flag ClickhouseWriteFanoutFlag to conditionally drop writes to alternate ClickHouse endpoints. No review comments were provided, and there is no additional feedback.

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[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
3125	2	3123	6

View the top 2 failed test(s) by shortest run time

github.com/e2b-dev/infra/tests/integration/internal/tests/proxies::TestMaskRequestHostAPIParameter

Stack Traces | 4.76s run time

=== RUN   TestMaskRequestHostAPIParameter
=== PAUSE TestMaskRequestHostAPIParameter
=== CONT  TestMaskRequestHostAPIParameter
    mask_request_host_test.go:44: Command [python3] output: event:{start:{pid:1114}}
    mask_request_host_test.go:68: Command [cat] output: event:{start:{pid:1115}}
    mask_request_host_test.go:68: Command [cat] output: event:{data:{stderr:"cat: /tmp/nc_output.txt: No such file or directory\n"}}
    mask_request_host_test.go:68: Command [cat] output: event:{end:{exit_code:1 exited:true status:"exit status 1" error:"exit status 1"}}
    mask_request_host_test.go:69: 
        	Error Trace:	.../tests/proxies/mask_request_host_test.go:69
        	Error:      	Received unexpected error:
        	            	command cat in sandbox i9hwd6eze8yl3rtnsml2m failed with exit code 1
        	Test:       	TestMaskRequestHostAPIParameter
--- FAIL: TestMaskRequestHostAPIParameter (4.76s)

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestCommandKillNextApp

Stack Traces | 266s run time

=== RUN   TestCommandKillNextApp
=== PAUSE TestCommandKillNextApp
=== CONT  TestCommandKillNextApp
Executing command /bin/bash in sandbox izhhetcxhw4ci9wfswsz2
    process_test.go:30: Build failed: {<nil> build was cancelled <nil>}
--- FAIL: TestCommandKillNextApp (266.43s)

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