[receiver/prometheusremotewrite] Flaky test

[ArthurSens]

Component(s)

receiver/prometheusremotewrite

Describe the issue you're reporting

I've just noticed we have some flaky tests in main: https://github.com/open-telemetry/opentelemetry-collector-contrib/actions/runs/12146357038/job/33870088465

=== FAIL: . TestComponentLifecycle/metrics-lifecycle (0.00s)
    generated_component_test.go:65: 
        	Error Trace:	/home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/receiver/prometheusremotewritereceiver/generated_component_test.go:65
        	Error:      	Received unexpected error:
        	            	failed to create prometheus remote-write listener: listen tcp 127.0.0.1:9090: bind: address already in use
        	Test:       	TestComponentLifecycle/metrics-lifecycle

=== FAIL: . TestComponentLifecycle (0.00s)

=== FAIL: . TestHandlePRWContentTypeNegotiation/no_content_type (0.00s)
    receiver_test.go:90: 
        	Error Trace:	/home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/receiver/prometheusremotewritereceiver/receiver_test.go:90
        	Error:      	Received unexpected error:
        	            	Post "http://localhost:9090/api/v1/write": dial tcp [::1]:9090: connect: connection refused
        	Test:       	TestHandlePRWContentTypeNegotiation/no_content_type

=== FAIL: . TestHandlePRWContentTypeNegotiation (0.00s)
    receiver_test.go:[43](https://github.com/open-telemetry/opentelemetry-collector-contrib/actions/runs/12146357038/job/33870088465#step:7:44): 
        	Error Trace:	/home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/receiver/prometheusremotewritereceiver/receiver_test.go:36
        	            				/home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/receiver/prometheusremotewritereceiver/receiver_test.go:43
        	Error:      	Received unexpected error:
        	            	failed to create prometheus remote-write listener: listen tcp 127.0.0.1:9090: bind: address already in use
        	Test:       	TestHandlePRWContentTypeNegotiation

[github-actions]

Pinging code owners:

• receiver/prometheusremotewrite: @dashpole @ArthurSens

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[ArthurSens]

/label -needs-triage

[dashpole]

maybe we need to change tests to use a random port?

[ArthurSens]

Yeah, that's probably enough :)