Merge #130993

130993: nogo: fix unconvert exclude rules r=vidit-bhat,nameisbhaskar a=srosenberg

In [1], a regression was added in `exclude_files`
for the `unconvert` linter. This regression only
affects builds instrumented with coverage; see [2] for further details.

As a workaround for [2], we extend `exclude_files` to exclude Go sources generated from protobuf,
having the optional suffix of the form `_[0-9]+`.

[1] #124155
[2] bazel-contrib/rules_go#4110

Epic: none

Release note: None

Co-authored-by: Stan Rosenberg <[email protected]>

build/bazelutil/nogo_config.json

@@ -1624,7 +1624,7 @@
             "github.com/elastic/gosigar": "third-party",
             "github.com/shirou/gopsutil": "third-party code",
             "pkg/.*\\.eg\\.go$": "generated code",
-            ".*\\.pb\\.go$": "generated code",
+            ".*\\.pb(_[0-9]+)?\\.go$": "generated code",
             ".*\\.pb\\.gw\\.go$": "generated code",
             "pkg/.*_generated\\.go$": "generated code"
         }