[Bug]: Flaky test in `otelconf/v0.2.0`

[MrAlias]

https://github.com/open-telemetry/opentelemetry-go-contrib/actions/runs/18991376824/job/54244892209?pr=8113

--- FAIL: Test_otlpGRPCLogExporter (30.01s)
    --- FAIL: Test_otlpGRPCLogExporter/no_TLS_config (10.00s)
        log_test.go:882: 
            	Error Trace:	/Users/runner/work/opentelemetry-go-contrib/opentelemetry-go-contrib/otelconf/v0.3.0/log_test.go:883
            	            				/Users/runner/hostedtoolcache/go/1.25.0/x64/src/runtime/asm_amd64.s:1693
            	Error:      	Received unexpected error:
            	            	exporter export timeout: rpc error: code = DeadlineExceeded desc = context deadline exceeded
        log_test.go:882: 
            	Error Trace:	/Users/runner/work/opentelemetry-go-contrib/opentelemetry-go-contrib/otelconf/v0.3.0/log_test.go:882
            	Error:      	Condition never satisfied
            	Test:       	Test_otlpGRPCLogExporter/no_TLS_config
    --- FAIL: Test_otlpGRPCLogExporter/with_TLS_config (10.00s)
        log_test.go:882: 
            	Error Trace:	/Users/runner/work/opentelemetry-go-contrib/opentelemetry-go-contrib/otelconf/v0.3.0/log_test.go:883
            	            				/Users/runner/hostedtoolcache/go/1.25.0/x64/src/runtime/asm_amd64.s:1693
            	Error:      	Received unexpected error:
            	            	exporter export timeout: rpc error: code = DeadlineExceeded desc = context deadline exceeded
        log_test.go:882: 
            	Error Trace:	/Users/runner/work/opentelemetry-go-contrib/opentelemetry-go-contrib/otelconf/v0.3.0/log_test.go:882
            	Error:      	Condition never satisfied
            	Test:       	Test_otlpGRPCLogExporter/with_TLS_config
    --- FAIL: Test_otlpGRPCLogExporter/with_TLS_config_and_client_key (10.00s)
        log_test.go:882: 
            	Error Trace:	/Users/runner/work/opentelemetry-go-contrib/opentelemetry-go-contrib/otelconf/v0.3.0/log_test.go:883
            	            				/Users/runner/hostedtoolcache/go/1.25.0/x64/src/runtime/asm_amd64.s:1693
            	Error:      	Received unexpected error:
            	            	exporter export timeout: rpc error: code = DeadlineExceeded desc = context deadline exceeded
        log_test.go:882: 
            	Error Trace:	/Users/runner/work/opentelemetry-go-contrib/opentelemetry-go-contrib/otelconf/v0.3.0/log_test.go:882
            	Error:      	Condition never satisfied
            	Test:       	Test_otlpGRPCLogExporter/with_TLS_config_and_client_key