drop caliper support

[garlick]

Problem: caliper test setfaults in CI after modifying linkage arguments for macos portability.

The caliper hooks are probably in the wrong places at this point anyway. Drop caliper support from Flux for now.

This can be reverted when someone has time to spend working on the caliper hooks and linkage.

[grondo]

LGTM!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.61%. Comparing base (01f3097) to head (ecfe518).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/common/libflux/msg_handler.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6475       +/-   ##
===========================================
+ Coverage   53.73%   83.61%   +29.87%     
===========================================
  Files         475      524       +49     
  Lines       79521    87485     +7964     
===========================================
+ Hits        42731    73148    +30417     
+ Misses      36790    14337    -22453     

Files with missing lines	Coverage Δ
src/broker/broker.c	77.10% <ø> (+20.59%)	⬆️
src/broker/module.c	79.59% <ø> (+12.15%)	⬆️
src/cmd/builtin/version.c	92.30% <ø> (-0.29%)	⬇️
src/cmd/flux-start.c	83.93% <ø> (+29.38%)	⬆️
src/common/libflux/handle.c	83.98% <ø> (+5.07%)	⬆️
src/common/libflux/rpc.c	90.09% <ø> (-3.91%)	⬇️
src/common/libflux/msg_handler.c	86.54% <0.00%> (+7.88%)	⬆️

... and 440 files with indirect coverage changes