feat: configurable external check failures (#6810)

Co-authored-by: Tom French <15848336+TomAFrench@users.noreply.github.com>

Author: asterite

.github/critical_libraries_status/AztecProtocol/aztec-packages/noir-projects/aztec-nr.failures.jsonl

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+# Critical Libraries Status
+
+This directory contains one `.failures.jsonl` file per external directory that is checked by CI.
+CI will run the external repository tests and compare the test failures against those recorded
+in these files. If there's a difference, CI will fail.
+
+This allows us to mark some tests as expected to fail if we introduce breaking changes.
+When tests are fixed on the external repository, CI will let us know that we need to remove
+the `.failures.jsonl` failures on our side.
+
+The format of the `.failures.jsonl` files is one JSON per line with a failure:
+
+```json
+{"suite":"one","name":"foo"}
+```
+
+If it's expected that an external repository doesn't compile (because a PR introduces breaking changes
+to, say, the type system) you can remove the `.failures.jsonl` file for that repository and CI
+will pass again. Once the repository compiles again, CI will let us know and require us to put
+back the `.failures.jsonl` file.

.github/critical_libraries_status/AztecProtocol/aztec-packages/noir-projects/noir-contracts.failures.jsonl

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+{"event":"started","name":"one","test_count":1,"type":"suite"}
+{"event":"started","name":"foo","suite":"one","type":"test"}
+{"event":"failed","exec_time":0.05356625,"name":"foo","suite":"one","type":"test"}
+{"event":"ok","failed":0,"ignored":0,"passed":1,"type":"suite"}