Add security_mode metric tag to request metrics

[KauzClay]

Fixes #

In support of: #14092
Relies on: knative/networking#842

Proposed Changes

• activator can dynamically pick up changes in config-network
• activator metrics handler sets security mode tag on request metrics based on the network config value from context
• queue proxy also sets security mode metric. Security mode is set as an env var

Release Note

Activator and QueueProxy now tag certain request metrics with "security_mode" data that corresponds to the value of dataplane-trust on config-network

[knative-prow]

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[codecov]

Codecov Report

Patch coverage: 93.54% and no project coverage change.

Comparison is base (e9425f8) 86.26% compared to head (0fc6863) 86.26%.

❗ Current head 0fc6863 differs from pull request most recent head b6e8c10. Consider uploading reports for the commit b6e8c10 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #14265    +/-   ##
========================================
  Coverage   86.26%   86.26%            
========================================
  Files         195      199     +4     
  Lines       14702    14827   +125     
========================================
+ Hits        12683    12791   +108     
- Misses       1719     1734    +15     
- Partials      300      302     +2     

Files Changed	Coverage Δ
cmd/activator/main.go	0.00% <0.00%> (ø)
pkg/queue/sharedmain/main.go	0.86% <0.00%> (ø)
pkg/activator/config/store.go	100.00% <100.00%> (ø)
pkg/activator/handler/metric_handler.go	100.00% <100.00%> (ø)
pkg/activator/handler/metrics.go	92.59% <100.00%> (ø)
pkg/queue/request_metric.go	92.56% <100.00%> (+0.18%)	⬆️
pkg/reconciler/revision/resources/queue.go	98.43% <100.00%> (+0.01%)	⬆️

... and 7 files with indirect coverage changes

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[dprotaso]

Based on this comment it seems like we'd go for the request logging approach

#14092 (comment)

[knative-prow-robot]

PR needs rebase.

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[KauzClay]

Based on this comment it seems like we'd go for the request logging approach
#14092 (comment)

yup, I'll close this and get started on a different PR for doing it via logs