Add diverse transport types to test data

[hulto]

Updated the test data generation to use HTTP1, GRPC, and DNS transports instead of all beacons being TRANSPORT_UNSPECIFIED. The beacons now cycle through the three transport types to provide more realistic test data.

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[cmp5987]

LGTM --- Thanks for expanding the test data :)

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
2744    ±0	2744    ±0	0    ±0	0    ±0	0    ±0	0    ±0	1ms    ±0

Previous Results

Build 🏗️	Result 🧪	Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
#150	✅	2744	2744	0	0	0	0	26.6s

Insights

Average Tests per Run	Total Flaky Tests	Total Failed	Slowest Test (p95)
2744	0	0	43.2s

Slowest Tests

Test 📝	Results 📊	Duration (avg) ⏱️	Duration (p95) ⏱️
eldritch: random::string_impl::tests::test_string_uniform	3	39.4s	43.2s
eldritch: random::string_impl::tests::test_string_uniform	3	39.4s	43.2s
eldritch: random::string_impl::tests::test_string_uniform	3	39.4s	43.2s
eldritch: random::int_impl::tests::test_random_int_uniform_average	3	3.8s	7.8s
eldritch: random::int_impl::tests::test_random_int_uniform_average	3	3.8s	7.8s
eldritch: random::int_impl::tests::test_random_int_uniform_average	3	3.8s	7.8s
eldritch: random::int_impl::tests::test_random_int_uniform_chi_square	3	3.8s	7.7s
eldritch: random::int_impl::tests::test_random_int_uniform_chi_square	3	3.8s	7.7s
eldritch: random::int_impl::tests::test_random_int_uniform_chi_square	3	3.8s	7.7s
eldritch: random::string_impl::tests::test_string_length	3	5.9s	7.7s

_{🎉 No failed tests in this run. | 🍂 No flaky tests in this run.}

Github Test Reporter by CTRF 💚

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