What

This MR disable alerts for pipelining long tests. The tests are not completely disable since we still manually check them from time to time.

Why

This tests results are not reliable and produce useless alerts.

Set the number of previous run to compare with to 0 to disable the alerts.

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
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