add prepare-release make target

[codeboten]

make prepare-release does the following:

• checks the local repository is clean
• search/replace PREVIOUS_VERSION with RELEASE_CANDIDATE
• runs make genotelcorecol
• creates a commit on a new branch
• runs make multimod-prerelease
• commits the changes to the branch
• creates a PR

[codecov]

Codecov Report

Merging #5503 (5572dbb) into main (f535075) will increase coverage by 0.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5503      +/-   ##
==========================================
+ Coverage   90.79%   91.40%   +0.61%     
==========================================
  Files         193      192       -1     
  Lines       11430    11416      -14     
==========================================
+ Hits        10378    10435      +57     
+ Misses        830      781      -49     
+ Partials      222      200      -22     

Impacted Files	Coverage Δ
pdata/internal/metrics.go	84.09% <0.00%> (-8.41%)	⬇️
service/config_provider.go	83.78% <0.00%> (-8.11%)	⬇️
internal/testutil/testutil.go	66.66% <0.00%> (-6.07%)	⬇️
service/zpages.go	68.08% <0.00%> (-3.69%)	⬇️
pdata/internal/common.go	91.85% <0.00%> (-3.54%)	⬇️
service/internal/telemetry/process_telemetry.go	71.55% <0.00%> (-1.67%)	⬇️
processor/batchprocessor/batch_processor.go	90.67% <0.00%> (-1.04%)	⬇️
config/configgrpc/configgrpc.go	92.78% <0.00%> (-0.14%)	⬇️
service/host.go	100.00% <0.00%> (ø)
client/client.go	100.00% <0.00%> (ø)
... and 51 more

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