fix: send to closed chan in discovery

[jjeffcaii]

What this PR does:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
10.9% Duplication

[codecov-commenter]

Codecov Report

Patch coverage: 90.90% and project coverage change: +0.09% 🎉

Comparison is base (df70525) 39.45% compared to head (9a014e9) 39.55%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #768      +/-   ##
==========================================
+ Coverage   39.45%   39.55%   +0.09%     
==========================================
  Files         261      261              
  Lines       26542    26561      +19     
==========================================
+ Hits        10471    10505      +34     
+ Misses      14940    14926      -14     
+ Partials     1131     1130       -1     

Files Changed	Coverage Δ
pkg/boot/discovery_watch.go	62.06% <90.90%> (+21.86%)	⬆️

... and 1 file with indirect coverage changes

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