EDSC-3460: Remove support for Echo-Token

[macrouch]

Overview

What is the feature?

Removed support for the Echo-Token header.

Checklist

• I have added automated tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[codecov]

Codecov Report

Merging #13 (f450132) into main (1c6a2e0) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #13   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           43        43           
  Lines          982       970   -12     
  Branches       147       138    -9     
=========================================
- Hits           982       970   -12     

Impacted Files	Coverage Δ
src/cmr/concepts/subscription.js	100.00% <ø> (ø)
src/utils/cmrDelete.js	100.00% <ø> (ø)
src/utils/cmrIngest.js	100.00% <ø> (ø)
src/utils/cmrQuery.js	100.00% <ø> (ø)

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