tools: fix the CSV format error and add build target 'tools' in Makefile

[ahrtr]

The minor change is extracted from #15060. It should can be reviewed and merged separately.

Signed-off-by: Benjamin Wang [email protected]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[codecov-commenter]

Codecov Report

Merging #15196 (3da5613) into main (3d3cb46) will decrease coverage by 0.16%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main   #15196      +/-   ##
==========================================
- Coverage   74.75%   74.60%   -0.16%     
==========================================
  Files         415      415              
  Lines       34318    34318              
==========================================
- Hits        25655    25603      -52     
- Misses       7032     7077      +45     
- Partials     1631     1638       +7     

Flag	Coverage Δ
all	74.60% <ø> (-0.16%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
client/v3/leasing/util.go	91.66% <0.00%> (-6.67%)	⬇️
server/etcdserver/api/v3rpc/auth.go	79.34% <0.00%> (-4.35%)	⬇️
client/v3/leasing/cache.go	87.77% <0.00%> (-3.89%)	⬇️
server/etcdserver/txn/util.go	96.42% <0.00%> (-3.58%)	⬇️
server/etcdserver/api/v3rpc/util.go	70.96% <0.00%> (-3.23%)	⬇️
client/v3/leasing/txn.go	88.09% <0.00%> (-3.18%)	⬇️
server/etcdserver/api/v3rpc/interceptor.go	74.47% <0.00%> (-3.13%)	⬇️
server/proxy/grpcproxy/watch.go	93.64% <0.00%> (-2.90%)	⬇️
server/etcdserver/api/v3election/election.go	66.66% <0.00%> (-2.78%)	⬇️
client/v3/experimental/recipes/key.go	75.34% <0.00%> (-2.74%)	⬇️
... and 12 more

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