Remove old interface code for inject_tlm

[jmthomas]

closes #1511

Turns out a previous refactor already removed the logging for inject_tlm. Not sure what additional 'cmd' logging the ticket is referring to.

[codecov[bot]]

Codecov Report

Merging #1689 (df70911) into master (f785bd0) will increase coverage by 0.24%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1689      +/-   ##
==========================================
+ Coverage   78.19%   78.44%   +0.24%     
==========================================
  Files         235      208      -27     
  Lines       18150    16948    -1202     
==========================================
- Hits        14193    13295     -898     
+ Misses       3957     3653     -304     

Impacted Files	Coverage Δ
app/controllers/metadata_controller.rb
app/controllers/application_controller.rb
config/environments/test.rb
config/application.rb
app/controllers/timeline_controller.rb
app/channels/streaming_channel.rb
app/controllers/completed_script_controller.rb
app/channels/application_cable/channel.rb
app/controllers/trigger_group_controller.rb
app/controllers/environment_controller.rb
... and 18 more

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