ccl/sqlproxyccl: TestPrivateEndpointsACL failed

[cockroach-teamcity]

ccl/sqlproxyccl.TestPrivateEndpointsACL failed with artifacts on release-24.3 @ 232c636b5477e06c1b25b04b3a3c710fdf7a8b2e:

=== RUN   TestPrivateEndpointsACL
    test_log_scope.go:165: test logs captured to: /artifacts/tmp/_tmp/8b67916b40b2ca2b9d724d711ff9c3e7/logTestPrivateEndpointsACL1324483565
    test_log_scope.go:76: use -show-logs to present logs inline
    test_server_shim.go:152: automatically injected an external process virtual cluster under test; see comment at top of test_server_shim.go for details.
    proxy_handler_test.go:466: -- test log scope end --
test logs left over in: /artifacts/tmp/_tmp/8b67916b40b2ca2b9d724d711ff9c3e7/logTestPrivateEndpointsACL1324483565
--- FAIL: TestPrivateEndpointsACL (2.05s)
=== RUN   TestPrivateEndpointsACL/private_connection_allowed
    proxy_handler_test.go:395: 
        	Error Trace:	pkg/ccl/sqlproxyccl/proxy_handler_test.go:2944
        	Error:      	Expected nil, but got: &sqlproxyccl.errWithCode{
        	            	    code:  4,
        	            	    cause: &withstack.withStack{
        	            	        cause: &errutil.withPrefix{
        	            	            cause:  &errors.errorString{s:"proxyproto: proxy protocol signature not present"},
        	            	            prefix: "while receiving startup message",
        	            	        },
        	            	        stack: &withstack.stack{0x4336731, 0x43430fc, 0x4348c88, 0x1245eb8, 0x48ec44},
        	            	    },
        	            	}
        	Test:       	TestPrivateEndpointsACL/private_connection_allowed
    --- FAIL: TestPrivateEndpointsACL/private_connection_allowed (0.05s)

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See also: How To Investigate a Go Test Failure (internal)

/cc @cockroachdb/sql-foundations @cockroachdb/server

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Jira issue: CRDB-45006