[NPM-4125] Refactor connection direction to be stateful based on SYN packets

[pimlu]

What does this PR do?

This PR uses the SYN from traffic as the connection direction and, importantly, refactors connection tuples within the TCP processor to not include connection direction. This is because the TCP processor can't infer connection direction from packet headers.

Motivation

More accurate handling of connection direction - previously it was calling determineConnectionDirection every packet instead of once when the connection is established. I think it was incidentally correct most of the time before, but this is more robust.

Describe how you validated your changes

Possible Drawbacks / Trade-offs

Additional Notes

[agent-platform-auto-pr]

[Fast Unit Tests Report]

On pipeline 51922501 (CI Visibility). The following jobs did not run any unit tests:

Jobs:

• tests_deb-arm64-py3
• tests_deb-x64-py3
• tests_flavor_dogstatsd_deb-x64
• tests_flavor_heroku_deb-x64
• tests_flavor_iot_deb-x64
• tests_rpm-arm64-py3
• tests_rpm-x64-py3
• tests_windows-x64

If you modified Go files and expected unit tests to run in these jobs, please double check the job logs. If you think tests should have been executed reach out to #agent-devx-help

[agent-platform-auto-pr]

Uncompressed package size comparison

Comparison with ancestor 20c010fda49b74b0c99a64b8f50e5219061008d8

Diff per package

package	diff	status	size	ancestor	threshold
datadog-agent-amd64-deb	0.01MB	⚠️	1191.08MB	1191.07MB	140.00MB
datadog-agent-x86_64-rpm	0.01MB	⚠️	1200.40MB	1200.39MB	140.00MB
datadog-agent-x86_64-suse	0.01MB	⚠️	1200.40MB	1200.39MB	140.00MB
datadog-agent-arm64-deb	0.00MB	✅	935.37MB	935.37MB	140.00MB
datadog-agent-aarch64-rpm	0.00MB	✅	944.67MB	944.66MB	140.00MB
datadog-dogstatsd-amd64-deb	0.00MB	✅	78.54MB	78.54MB	10.00MB
datadog-dogstatsd-x86_64-rpm	0.00MB	✅	78.62MB	78.62MB	10.00MB
datadog-dogstatsd-x86_64-suse	0.00MB	✅	78.62MB	78.62MB	10.00MB
datadog-dogstatsd-arm64-deb	0.00MB	✅	55.75MB	55.75MB	10.00MB
datadog-heroku-agent-amd64-deb	0.00MB	✅	505.27MB	505.27MB	70.00MB
datadog-iot-agent-amd64-deb	0.00MB	✅	113.34MB	113.34MB	10.00MB
datadog-iot-agent-x86_64-rpm	0.00MB	✅	113.41MB	113.41MB	10.00MB
datadog-iot-agent-x86_64-suse	0.00MB	✅	113.41MB	113.41MB	10.00MB
datadog-iot-agent-arm64-deb	0.00MB	✅	108.81MB	108.81MB	10.00MB
datadog-iot-agent-aarch64-rpm	0.00MB	✅	108.88MB	108.88MB	10.00MB

Decision

⚠️ Warning

[agent-platform-auto-pr]

Test changes on VM

Use this command from test-infra-definitions to manually test this PR changes on a VM:

inv aws.create-vm --pipeline-id=51922501 --os-family=ubuntu

Note: This applies to commit 67a75b0