Cardano signatures are not produced on `testing-sanchonet`

[jpraynaud]

Why

Cardano transactions are not produced consistently on the testing-sanchonet. The problem is not occurring on the testing-preview network which is running the same code as testing-sanchonet.

What

Investigate and fix the problem which prevent consistent signing.

How

• [x] Investigate the problem on the signature process in testing-sanchonet: parse problem with some blocks
  • [x] Activate GitHub environment variable AGGREGATOR_ALLOW_UNPARSABLE_BLOCK to true
  • [x] File a bug on pallas repository
• [x] Fix the signature process in testing-sanchonet:
  • [x] Apply pallas patch
  • [x] Rollback GitHub environment variable AGGREGATOR_ALLOW_UNPARSABLE_BLOCK to false
  • [x] Reset Cardano transactions stores of aggregator