Revert "Add 'features' command to print available feature gates"

[yurishkuro]

This reverts commit 5caf4e4.

Which problem is this PR solving?

• Since upstream PR Feature command open-telemetry/opentelemetry-collector#12014 was merged, we don't need our own command anymore

Description of the changes

• Revert previous PR

How was this change tested?

$ go run ./cmd/jaeger featuregate

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.05%. Comparing base (84212d2) to head (3be3853).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6771      +/-   ##
==========================================
+ Coverage   96.04%   96.05%   +0.01%     
==========================================
  Files         364      363       -1     
  Lines       20692    20675      -17     
==========================================
- Hits        19874    19860      -14     
+ Misses        624      622       -2     
+ Partials      194      193       -1     

Flag	Coverage Δ
badger_v1	9.76% <ø> (ø)
badger_v2	1.82% <ø> (ø)
cassandra-4.x-v1-manual	14.81% <ø> (ø)
cassandra-4.x-v2-auto	1.81% <ø> (ø)
cassandra-4.x-v2-manual	1.81% <ø> (ø)
cassandra-5.x-v1-manual	14.81% <ø> (ø)
cassandra-5.x-v2-auto	1.81% <ø> (ø)
cassandra-5.x-v2-manual	1.81% <ø> (ø)
elasticsearch-6.x-v1	19.15% <ø> (ø)
elasticsearch-7.x-v1	19.23% <ø> (ø)
elasticsearch-8.x-v1	19.40% <ø> (ø)
elasticsearch-8.x-v2	1.82% <ø> (ø)
grpc_v1	10.81% <ø> (ø)
grpc_v2	7.80% <ø> (ø)
kafka-3.x-v1	10.13% <ø> (ø)
kafka-3.x-v2	1.82% <ø> (ø)
memory_v2	1.82% <ø> (ø)
opensearch-1.x-v1	19.28% <ø> (ø)
opensearch-2.x-v1	19.28% <ø> (ø)
opensearch-2.x-v2	1.82% <ø> (ø)
tailsampling-processor	0.48% <ø> (ø)
unittests	94.94% <ø> (+0.01%)	⬆️

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