Drop micrometer shim

[jack-berg]

Completes moving the micrometer shim to opentelemetry-java-instrumentation. Shouldn't be merged after #6560 is merged.

[codecov]

Codecov Report

Base: 90.60% // Head: 90.77% // Increases project coverage by +0.16% 🎉

Coverage data is based on head (d3586fb) compared to base (66285e2).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4735      +/-   ##
============================================
+ Coverage     90.60%   90.77%   +0.16%     
+ Complexity     4906     4815      -91     
============================================
  Files           567      551      -16     
  Lines         14728    14366     -362     
  Branches       1414     1395      -19     
============================================
- Hits          13345    13041     -304     
+ Misses          959      909      -50     
+ Partials        424      416       -8     

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