Revert "interop: Add metrics to track CrossUnsafe and CrossSafe heads…

[axelKingsley]

…. (#13923)"

This reverts commit a3c8069.

The commit was causing immediate crashes, only observed when running in live environments like Kurtosis. To get develop healthy for release tagging, I would like to remove this commit until it can be fixed and restored.

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.

Project coverage is 42.08%. Comparing base (a96a098) to head (226089a).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
op-service/metrics/ref_metrics.go	62.50%	3 Missing ⚠️
op-node/metrics/metrics.go	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (a96a098) and HEAD (226089a). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (a96a098)	HEAD (226089a)
cannon-go-tests-64	2	0
cannon-go-tests-32	2	0

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #14190       +/-   ##
============================================
- Coverage    66.93%   42.08%   -24.85%     
============================================
  Files           57      832      +775     
  Lines         4672    75169    +70497     
============================================
+ Hits          3127    31636    +28509     
- Misses        1376    40730    +39354     
- Partials       169     2803     +2634     

Flag	Coverage Δ
cannon-go-tests-32	?
cannon-go-tests-64	?

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Files with missing lines	Coverage Δ
op-supervisor/metrics/metrics.go	74.75% <ø> (ø)
op-supervisor/metrics/noop.go	42.85% <ø> (ø)
op-supervisor/supervisor/backend/backend.go	32.05% <100.00%> (ø)
op-supervisor/supervisor/backend/chain_metrics.go	53.84% <ø> (ø)
op-supervisor/supervisor/backend/db/db.go	10.44% <100.00%> (ø)
op-supervisor/supervisor/backend/db/update.go	0.00% <ø> (ø)
op-node/metrics/metrics.go	83.73% <0.00%> (ø)
op-service/metrics/ref_metrics.go	95.16% <62.50%> (ø)

... and 881 files with indirect coverage changes