Remove feature flag from heartbeat metrics.

[nharper285]

Summary of the Pull Request

What is this about? Remove the use of a feature flag around two metric calls.

[codecov-commenter]

Codecov Report

Merging #3505 (5514ab3) into main (cde6a19) will decrease coverage by 0.48%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3505      +/-   ##
==========================================
- Coverage   39.48%   39.00%   -0.48%     
==========================================
  Files         299      271      -28     
  Lines       36318    31325    -4993     
==========================================
- Hits        14339    12218    -2121     
+ Misses      21979    19107    -2872     

Files Changed	Coverage Δ
...Service/ApiService/Functions/QueueNodeHeartbeat.cs	0.00% <0.00%> (ø)
...Service/ApiService/Functions/QueueTaskHeartbeat.cs	0.00% <0.00%> (ø)

... and 59 files with indirect coverage changes