Fix wasm zcoin tests failures due to light client unavailability

[shamardy]

The following tests are failing most probably due to the lightwallet client used https://pirate.battlefield.earth:8581:

---

Test 1

komodo-defi-framework/mm2src/coins/z_coin/storage/blockdb/mod.rs

Line 126 in 927f84b

async fn test_transport() {

Error:

panicked at 'assertion failed: latest_height.is_ok()', mm2src/coins/z_coin/storage/blockdb/mod.rs:133:9

---

Test 2

komodo-defi-framework/mm2src/coins/z_coin/tx_streaming_tests/wasm.rs

Line 15 in 927f84b

async fn test_zcoin_tx_streaming() {

Error:

RpcClientInitErr(UpdateBlocksCacheErr(GetLiveLightClientError("All the current light clients are unavailable.")))', mm2src/coins/z_coin/tx_streaming_tests/wasm.rs:30:10

---

Test 3

komodo-defi-framework/mm2src/mm2_main/src/wasm_tests.rs

Line 243 in ab23c11

async fn activate_z_coin_light() {

Error:

panicked at 'ARRR initialization error Object({"error": String("Error on platform coin ARRR creation: All the current light clients are unavailable."), "error_path": String("lib.z_coin_activation.z_coin.z_rpc"), "error_trace": String("lib:104] z_coin_activation:248] z_coin:927] z_rpc:523] z_rpc:191]"), "error_type": String("CoinCreationError"), "error_data": Object({"ticker": String("ARRR"), "error": String("All the current light clients are unavailable.")})})', /home/runner/work/komodo-defi-framework/komodo-defi-framework/mm2src/mm2_test_helpers/src/for_tests.rs:3818:42

---

These tests were commented out in PR #2365 to have a green CI until they are fixed.

[borngraced]

cc. @smk762, our proxied lightwalletd servers seems not be working anymore for long now.

[cipig]

cc. @smk762, our proxied lightwalletd servers seems not be working anymore for long now.

there are more in https://github.com/KomodoPlatform/coins/blob/master/light_wallet_d/ARRR

[shamardy]

there are more in https://github.com/KomodoPlatform/coins/blob/master/light_wallet_d/ARRR

These are for native clients most probably, lightwalletds that support wasm clients are proxied ones.