[cmd/telemetrygen] Better defaults for HTTP exporter mode (#27007) #7

Job	Run time
windows-unittest-matrix (receiver-0)	33m 23s
windows-unittest-matrix (receiver-1)	30m 42s
windows-unittest-matrix (processor)	19m 27s
windows-unittest-matrix (exporter)	34m 54s
windows-unittest-matrix (extension)	19m 49s
windows-unittest-matrix (internal)	20m 28s
windows-unittest-matrix (pkg)	19m 26s
windows-unittest-matrix (cmd)	33m 18s
windows-unittest-matrix (other)	27m 33s
windows-unittest	3s
	3h 59m 3s

Provide feedback