server: remaining errors.Is conversions

[redwrasse]

Remaining errors.Is conversions for server module, as part of #18576.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @redwrasse. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 57.14286% with 9 lines in your changes missing coverage. Please review.

Project coverage is 68.72%. Comparing base (6ea81c1) to head (ccd65fe).

❗ Current head ccd65fe differs from pull request most recent head 5d242b0

Please upload reports for the commit 5d242b0 to get more accurate results.

Files with missing lines	Patch %	Lines
server/etcdserver/api/v2discovery/discovery.go	0.00%	1 Missing and 1 partial ⚠️
server/etcdserver/api/v3rpc/watch.go	50.00%	1 Missing and 1 partial ⚠️
server/etcdserver/api/rafthttp/snapshot_sender.go	0.00%	0 Missing and 1 partial ⚠️
server/etcdserver/api/v3rpc/lease.go	83.33%	0 Missing and 1 partial ⚠️
server/proxy/grpcproxy/lease.go	0.00%	0 Missing and 1 partial ⚠️
server/proxy/grpcproxy/maintenance.go	0.00%	1 Missing ⚠️
server/storage/wal/decoder.go	0.00%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

Files with missing lines	Coverage Δ
server/etcdserver/api/rafthttp/pipeline.go	97.40% <100.00%> (ø)
server/etcdserver/api/rafthttp/stream.go	81.81% <100.00%> (ø)
server/etcdserver/api/v3rpc/util.go	67.74% <100.00%> (ø)
server/lease/leasehttp/http.go	64.18% <100.00%> (+2.02%)	⬆️
server/etcdserver/api/rafthttp/snapshot_sender.go	84.15% <0.00%> (ø)
server/etcdserver/api/v3rpc/lease.go	77.21% <83.33%> (-5.07%)	⬇️
server/proxy/grpcproxy/lease.go	89.14% <0.00%> (ø)
server/proxy/grpcproxy/maintenance.go	39.39% <0.00%> (ø)
server/storage/wal/decoder.go	89.00% <0.00%> (ø)
server/etcdserver/api/v2discovery/discovery.go	63.31% <0.00%> (ø)
... and 1 more

... and 19 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18617      +/-   ##
==========================================
- Coverage   68.78%   68.72%   -0.06%     
==========================================
  Files         420      420              
  Lines       35519    35519              
==========================================
- Hits        24431    24410      -21     
- Misses       9662     9683      +21     
  Partials     1426     1426              

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