Identify Call Improvements

[jakobhero]

Description

PR improves data quality of identify call by making the following two changes:

• the IP is read directly from the xff header instead of the request middleware, which did not contain the client IP in the leftmost position described in the docs. the position of IPs in the xff header was verified through server logs
• include the region as user trait. this enables to segment users on an additional granularity level between city and country

Related Issue(s)

How to test

The PR depends on http headers populated and modified by the load balancer, so it cannot be accurately tested in the preview environment. ensuring that none of the previous functionality breaks can be done through:

• opening preview environment and signing up
• opening the Segment's Staging Untrusted source and verifying that the identify events come through for signup and login. don't worry if the IP in the payload is nonsensical, this is to be expected in the preview environment

Release Notes

NONE

Documentation

/werft analytics=segment|TEZnsG4QbLSxLfHfNieLYGF4cDwyFWoe

[codecov]

Codecov Report

Merging #8422 (a2ca2ce) into main (343ae26) will decrease coverage by 21.67%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #8422       +/-   ##
===========================================
- Coverage   32.85%   11.17%   -21.68%     
===========================================
  Files          33       18       -15     
  Lines        4745      993     -3752     
===========================================
- Hits         1559      111     -1448     
+ Misses       3068      880     -2188     
+ Partials      118        2      -116     

Flag	Coverage Δ
components-gitpod-cli-app	11.17% <ø> (ø)
components-local-app-app-darwin-amd64	?
components-local-app-app-darwin-arm64	?
components-local-app-app-linux-amd64	?
components-local-app-app-linux-arm64	?
components-local-app-app-windows-386	?
components-local-app-app-windows-amd64	?
components-local-app-app-windows-arm64	?
components-ws-manager-app	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/ws-manager/pkg/manager/status.go
components/ws-manager/pkg/manager/create.go
components/local-app/pkg/auth/pkce.go
components/ws-manager/pkg/manager/manager.go
...s/ws-manager/pkg/manager/internal/grpcpool/pool.go
components/ws-manager/pkg/clock/clock.go
components/local-app/pkg/auth/auth.go
...omponents/ws-manager/pkg/manager/pod_controller.go
components/ws-manager/pkg/manager/probe.go
components/ws-manager/pkg/manager/metrics.go
... and 5 more

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[AlexTugarev]

code changes look good to me.