[1.1.0 -> main] Test: Determine the failure of lib_advance_test using the number of unique unlinkable blocks

[linh2931]

lib_advance_test checks number of unlinkable blocks in stderr.txt to decide whethere the test fails or not. It scans stderr.txt, inserts any unlinkable_block it finds into a list, and uses the number of elements in the list as the number of unlinkable blocks. But the same unlinkable block can appear in stderr.txt multiple times due to multiple connections or repeated syncing:

debug 2025-02-10T18:01:07.023 net-3     net_plugin.cpp:3967           operator()           ] unlinkable_block 174 : 000000aedde07ade58031c2926de9c9ead20c35025d53ea973e50841c71504b0, previous 173 : 000000ad3ccc782661621ba4ea215907e103efaa8fe29b737a9c7910c118fed9
...
debug 2025-02-10T18:01:07.025 net-3     net_plugin.cpp:3967           operator()           ] unlinkable_block 174 : 000000aedde07ade58031c2926de9c9ead20c35025d53ea973e50841c71504b0, previous 173 : 000000ad3ccc782661621ba4ea215907e103efaa8fe29b737a9c7910c118fed9

That causes the same unlinkable block to be counted multiple times.

The fix is to count the number of the unique unlinkable blocks.

Merges release/1.1 into main including #1174

Resolves #1157

[ericpassmore]

Note:start
category: Tests
component: Internal
summary: Count the number of the unique unlinkable blocks in lib_advance_test
Note:end