Add connect event tree node support in activity tree

[mftoure]

Connect events were listed in the V2 event types but had no case in insertEvent, silently falling through to the default no-op path. Add ConnectNode (mirroring BindNode), InsertConnectEvent on SocketNode and ProcessNode, and wire the ConnectEventType case in insertEvent.

Proto serialization support requires an agent-payload update and is left as a follow-up.

What does this PR do?

Motivation

Describe how you validated your changes

Additional Notes

[github-actions]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 7d8fbb03f4

ℹ️ About Codex in GitHub

Codex has been enabled to automatically review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

When you sign up for Codex through ChatGPT, Codex can also answer questions or update the PR, like "@codex address that feedback".

[chatgpt-codex-connector]

Serialize connect endpoints before storing them

Because V2 profiles enable connect by default, nodes appended to this new Connect slice are now learned in memory, but profile persistence still goes through activity_tree.ToProto: socketNodeToProto only initializes and emits Bind entries, and protoDecodeProtoSocket only reads GetBind(). In any local/remote persistence or restart path, learned connect endpoints are therefore dropped, so a profile that learned outbound connections will reload/upload as sockets with no connect activity and will keep reporting the same connects as new.

Useful? React with 👍 / 👎.

[datadog-datadog-prod-us1-2]

🎯 Code Coverage (details)
• Patch Coverage: 1.64%
• Overall Coverage: 51.29% (+0.10%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 7d8fbb0 | Docs | Datadog PR Page | Give us feedback!}

[dd-octo-sts]

Files inventory check summary

File checks results against ancestor cfc647c1:

Results for datadog-agent_7.82.0~devel.git.484.7d8fbb0.pipeline.121974823-1_amd64.deb:

No change detected

[dd-octo-sts]

Static quality checks

✅ Please find below the results from static quality gates
Comparison made with ancestor cfc647c
📊 Static Quality Gates Dashboard
🔗 SQG Job

Successful checks

Info

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64	+4.74 KiB (0.00% increase, -0.04% of buffer)	747.641 → 747.645 → 758.200
✅	agent_deb_amd64_fips	+4.74 KiB (0.00% increase, -0.07% of buffer)	703.002 → 703.006 → 709.840
✅	agent_rpm_amd64	+4.74 KiB (0.00% increase, -0.04% of buffer)	747.624 → 747.629 → 758.170
✅	agent_rpm_amd64_fips	+4.74 KiB (0.00% increase, -0.07% of buffer)	702.985 → 702.990 → 709.840
✅	agent_rpm_arm64	+7.79 KiB (0.00% increase, -0.12% of buffer)	723.128 → 723.135 → 729.660
✅	agent_rpm_arm64_fips	+7.79 KiB (0.00% increase, -0.11% of buffer)	682.139 → 682.147 → 688.860
✅	agent_suse_amd64	+4.74 KiB (0.00% increase, -0.04% of buffer)	747.624 → 747.629 → 758.170
✅	agent_suse_amd64_fips	+4.74 KiB (0.00% increase, -0.07% of buffer)	702.985 → 702.990 → 709.840
✅	agent_suse_arm64	+7.79 KiB (0.00% increase, -0.12% of buffer)	723.128 → 723.135 → 729.660
✅	agent_suse_arm64_fips	+7.79 KiB (0.00% increase, -0.11% of buffer)	682.139 → 682.147 → 688.860
✅	docker_agent_amd64	+4.73 KiB (0.00% increase, -0.06% of buffer)	806.458 → 806.463 → 813.790
✅	docker_agent_arm64	+7.78 KiB (0.00% increase, -0.09% of buffer)	806.982 → 806.989 → 815.030
✅	docker_agent_jmx_amd64	+4.74 KiB (0.00% increase, -0.06% of buffer)	997.355 → 997.360 → 1004.550
✅	docker_agent_jmx_arm64	+7.79 KiB (0.00% increase, -0.09% of buffer)	986.532 → 986.539 → 994.710

19 successful checks with minimal change (< 2 KiB)

	Quality gate	Current Size
✅	agent_heroku_amd64	307.809 MiB
✅	agent_msi	618.817 MiB
✅	docker_cluster_agent_amd64	208.821 MiB
✅	docker_cluster_agent_arm64	222.005 MiB
✅	docker_cws_instrumentation_amd64	7.447 MiB
✅	docker_cws_instrumentation_arm64	6.877 MiB
✅	docker_dogstatsd_amd64	39.036 MiB
✅	docker_dogstatsd_arm64	37.180 MiB
✅	docker_host_profiler_amd64	305.309 MiB
✅	docker_host_profiler_arm64	316.410 MiB
✅	dogstatsd_deb_amd64	29.771 MiB
✅	dogstatsd_deb_arm64	27.830 MiB
✅	dogstatsd_rpm_amd64	29.771 MiB
✅	dogstatsd_suse_amd64	29.771 MiB
✅	iot_agent_deb_amd64	45.715 MiB
✅	iot_agent_deb_arm64	42.434 MiB
✅	iot_agent_deb_armhf	43.219 MiB
✅	iot_agent_rpm_amd64	45.716 MiB
✅	iot_agent_suse_amd64	45.714 MiB