[extension/basicauthextension]: Report for failed tests on main

[github-actions]

Auto-generated report for __run_3 job build.

Link to failed build: https://github.com/open-telemetry/opentelemetry-collector-contrib/actions/runs/15390501164

Test Failures

• TestBasicAuth_HtpasswdInlinePrecedence

Note: Information about any subsequent build failures that happen while
this issue is open, will be added as comments with more information to this issue.

[github-actions]

Pinging code owners for extension/basicauth: @frzifus. See Adding Labels via Comments if you do not have permissions to add labels yourself. For example, comment '/label priority:p2 -needs-triaged' to set the priority and remove the needs-triaged label.

[axw]

This test will fail on Windows, because it's trying to remove a file that hasn't been closed:

opentelemetry-collector-contrib/extension/basicauthextension/extension_test.go

Lines 149 to 151 in 903fda2

	f, err := os.CreateTemp(t.TempDir(), ".htpasswd")
	require.NoError(t, err)
	defer os.Remove(f.Name())

It's flaky because the file will be closed with a finalizer, which is not guaranteed to run before the os.Remove. This is easy enough to fix: use os.WriteFile to write to a file inside t.TempDir(), rather than opening a file and then writing to it. I'll send a PR.